[PurpleKat]

He does sounds like he's getting a bit old.
They start to loose their balance, strength and sleep more.
They can also struggle with chewing hard seeds, maybe baby food might help him have bit of food and fluids. Your hamster has done really well living past 2 years old and you should cherish all the time you have got left, just do what you can for them.

As for your vet that sounds like something that should be reported to your local authorities or the RSPCA if you are in the UK.