[cypher]

Most vets who have treated hamsters should be used to handling ones that aren't tame, even tame hams can get stressed & be hard to handle at the vet so they should be able to deal with it.
It is stressful for them but try not to worry about it too much, if his nails are too long then they have to be trimmed & it's probably better to get the vet to do it than have a go yourself if you're not confident about it.
Maybe his lack of activity & wheel use lately has just been down to the weather, they really do seem to prefer to stay in bed more when it's cold even in a heated house & more so as they get older.