My ginger Tom has appeared in the lounge not looking himself, subdued cranky but mobile and purring when stroked. He is arching his tail downwards and the base looks like it might be swollen. He has very dense fur so its hard to tell. He doesn't want us to touch him and is all bitey if we try and look. Worried he's in pain/ill and we cant do anything for him. He's my only ever pet and never been ill before so I don't really know how bad they need to be before we rouse a vet. I am I over worrying? Is tomorrow 1st thing ok?