Hi,I am new to this forum and would love some advise please, I have a 8 year old cat and she is one big cat,her name is "Tilly" last saturday she started to behave in a different manner, she would hide in the bedroom and did not like to be touched towards the lower back,she could not jump up on the chair,she showed disscomfort when she attempted to jump up and never managed it in the end, she always likes to sit on the back of the chair looking out of the window,she had not been out that day and we ruled out any type of accident,I took her to the vets and he could not find anything obvoious wrong with her, the only thing he could come up with is that she had been bitten on her lower back but he said there was no obvious sign to tell him this,though when he pressed on the lower back by the tail she was in some disscomfort,she still need to be lifted onto the chairs etc, but she seems a lot better in herself now, she is eating fine and uses the litter tray fine and also plays around by chaseing the light off a torch,she does however needs to be picked up onto the chair still,really confused as to what is wrong with her,could anyone give me advise please..many thanks,