Thank you everyone for the tips and advice. I have still not seen him do that neck action again.
And yes, I know I am a bit paranoid, but my baby girl died last year, after nearly 5 months of being sick (probably longer, because I'm counting from when she started wheezing). Two avian vets never were able to give her a diagnosis, but after more research, I highly suspect that it started with a bacterial infection, and that she died of a secondary fungal infection leading to sour crop. Since then I've done a lot of reading and research, even when he was healthy, so that I wouldn't have to rely solely on the vets. It did pay off, because when he got sick, I was able to recognize it very early.
His droppings, appetite, energy levels all have improved since starting the antibiotics. His energy is still low for him, but has increased. The improvement seemed to be overnight, and then a plateau. The tail bobbing started AFTER the rest seemed to get better, though it has decreased a bit again. Also today is the first time I noticed his nose seem congested. Every time before that, when I've been able to get a good enough look, it was clear. He's looking very shaggy, and the look of his face scares me, because that's how my Schwa looked when she died. It's hard to tell though because he also just had his big moult, and his poor lil head is covered in pin feathers.
Every time he's been out of his cage I've been sure to pay attention to his smell while getting a nose kiss. He smells good, no sourness. But I feel like by the time it would be, that's more progressed, and I wouldn't want it to get there in the first place.
Birds regurgitate often without being sick. 
What was your sweetie on Baytril for?
If your prescription for baytril is over you could bring your baby in for a recheck. Making sure the antibiotics did the trick will give you peace of mind.
It is possible that the antibiotics could allow a yeast infection to take hold, baytril will kill good and bad bacteria from their systems and it often leaves them vulnerable. Unlikely if you are using probiotics as well but possible. I would not be thinking it is avian gastric yeast. That's a long shot and not warranted at this point. The video appears to be normal behavior to me unless it continues or gets worse.
Mr. Wuggie is on Baytril for... acting sick. Vet did a fecal exam and found nothing, but agreed his droppings didn't look right, and based on my observations of his behavior. She said since we didn't know what it was exactly she was just going to use a more broad one and see if it helped. I requested probiotics as well, and she gave me "benebac" powder to sprinkle on his veggies. He is still on the Baytril, but I think he stopped drinking the water a few days ago. So yesterday I just gave him fresh water, and put a little Baytril on his veg instead. I think it worked.
I haven't seen him regurgitate once though since his mate died last August.
Ampho B is neither an antibiotic nor the treatment of choice for all yeast. It is a very powerful antifungal that treats avian gastric yeast specifically. It's not a drug that should be given lightly due to the side effects and the risk to the owner administering it. If you're concerned then more testing might be the right option, but seriously, we need to stop jumping to recommending Ampho B anytime anyone says the word yeast. It has the potential to do real harm.
Oh I wasn't planning on giving him medication without asking the vet. Just trying to figure out if it warrants an emergency trip. Her house is connected to her practice, so she does do late night emergency appointments if needed.
I completely agree with this. Amp B cured my macaw of AGY but nearly killed him in the process. It was awful awful stuff and I never want to have to administer it again. You have to protect yourself with gloves while administering it and my poor guy vomited like a volcano moments later.
That must have been so hard to see your birdie like that! I'm glad he made it.
Not to beat a dead horse but I think clarification is needed.
AGY is serious and often misdiagnosed. My macaw was presumed PDD positive until the AGY was found after multiple crop swabs.
While common in budgies, many live their whole lives with it and never have symptoms. It most often attacks weakened immune system birds and is secondary to another infection. If using an avian vet, a fresh fecal sample will easily show it in a gram stain if it's shedding.
When a bird is presenting illness you first consider bacteria or simple yeast. It's far more common than AGY and the same steps are taken to diagnose all. Even when I think the worst illness in a bird it does no good to scare the owner with worst case scenarios as we see with this thread.
Those have been the first things considered-- That's what the Baytril is for, even though she couldn't find anything...
I'd rather get scared "just in case" than have no idea, and lose my precious baby! I admit I'm extra paranoid though because between my sister's 3 budgies, and my own, I've never seen a budgie actually survive an illness. They're so fragile and it's heartbreaking.
He's GOING to be the exception though!
@SchwuggieLove one thing you can do that will not harm your bird but could help with a simple yeast is to provide probiotics. Another is use apple cider vinegar in the drinking water, 15 ml to a liter, once a week.
Because of the Baytril in his water, I haven't done the ACV yet, but I was definitely wanting to ask my vet about doing that after the Baytril is done. He does seem to be "eating" the probiotics pretty well though. I sprinkled it on his veggies and I didn't really see much left when I took it out. The first day I saw improvement was after 2 days on antibiotics, with probiotics that second day.
