Hi-I see your photo of the assistant holding Cosmo. It looks to me like she’s holding him appropriately. The first thing you learn about restraining birds is not to hold the chest tight. So I don’t think she could have hurt his chest (even though he is tiny). And Quakers are hard to take blood from, if blood is taken at the neck, it’s better to give anaesthesia rather than try multiple times and upset the bird.
I have Quakers who are used to being held in the hand. It helps them to be less scared at the vet. But I bet your baby WAS pretty scared. And he got very excited which is part of why he is so tired today. It was a very tough day for him.
I hope everything comes back normal. Pixiebeak has a good point—it’s pretty normal to be tired the day after a big trip and vet visit. Cosmo is barely used to your house yet, much less riding in a car and seeing traffic, and then seeing other animals and new humans at the vet.
I am happy to meet you and Cosmo. He is so pretty! What color is he, and do you know if he is a boy or girl? I have a blue Quaker named Willow. For 20 yrs before that, since I was in school, I had a green Quaker named Lucy.
Please ask any questions you might have and maybe check out QPS (Quaker parakeet society) because there are people there who love Quakers and can answer your questions.