My cat Lady has not been herself the last few days she has been really quiet and timid ( I put this down to hot weather) She has been drinking an awful lot (again I put this down to hot weather) , and all day today she has basically lived in th litter box, She keeps going in, squatting ( as if to do a wee) but not doing anything. If she is not in the litterbox she is sleeping. She was at the vets earlier in the week because she has an absess on her ear~I wondered if this could be related. She is not on any medication and was last wormed 6 weeks ago, no change in diet or surroundings. She is spayed.