I don't think he is eating the toys. I just think a bit is getting in him when playing. Especially when he needs to forage through toys to get to hidden pieces of millet etc.
He is incredibly hyperactive. He probably spends 4 hours or so a day out the cage, and that time is never stationary. It drives me nuts - it mostly consists of laps around the living room, then he'll land, attack my ear and repeat. The vet from yesterday commented on how hyperactive he is. That he is so full of energy, and does eat makes me feel a bit strange about the weight situation.
I've always limited seed consumption for 'special' things. Zara once suggested putting treats in the same place of the cage every time when he returns to the cage to make it easier. Well, it took a while, but now he ONLY gets sunflower seeds upon returning to the cage (he never causes problems with this anymore). I'm going to break that rule for the time being and give him many more. The same applies to millet, which was only ever given as a reward. I'll put some in the cage.
Failing that I don't know what I could do. In the morning he gets a teaspoon of seeds + two teaspoons of pellets. Then he'll get veggies (which he picks at but he plays with it at the very least because it ends up on the floor), then he'll get nutriberries in the afternoon. The food is never removed, and of course he never finishes it all. He's never shown any interest in mashed foods. I really don't want to give him formula on a spoon because we are already harassing him so much with medicine. Speaking of which...
He is to be given:
Calcium
B-Vitamins
Antibiotics
Sucralfate
Twice a day! The calcium 15 mins before the others which amounts to a very irritated bird. I looked online re: the sucralfate and it would seem to suggest its to prevent the absorption of anything bad he has eaten. Thing is, I don't think he has eaten anything bad. Moreover, he seems to be doing fine now. His tail wagging has dramatically reduced. He never does it out the cage when he's busy (which to me suggests it was ONLY itchiness due to a VERY uncomfortable molt... if it were seizures I don't think he'd be able to fly so perfectly, or "turn" them "on" and off as he does). When he loses balance it seems like he is kicking his legs back to try and scratch his rear end. His faeces apart from the wood was clear, so he has no parasites or bacterial infections down there. I think I have been going mad for a bird suffering severe itchiness.
She also commented on the colour of his feather. The ends of the feathers have dark streaks, which she suggested could be due to a genetic disorder. That honestly wouldn't surprise me considering he is the chick of my girlfriend's parents' birds. They bought both of them (plus a cage) at a fairground for only 35 euros 8 years ago. I highly doubt those birds were bred with optimal health in mind, and could likely be related.
But, in the end, I have no idea, and an exotic vet must be far more knowledgeable than me. We'll see how he responds to the meds.