I have a 17 yr old female cat. She is very very physically healthy runs about eats well although she does throw up a lot but vet said its age and no dry food as older cats sometimes are sick with it. But recently she has started acting odd and crying 24/7.Literally you can't even move but she stares and howls at you. Has now started crying at night and we are knackered. I live in a flat and she is fine as has a large and lovely roof terrace where she lies about all day and is happy with that. But she ran outside a few times (front so busy road) but always straight back apart from monday when she stayed out all day and came back at about 6. She was crying all night last night dp got up a few times and she was standing on the bannisters really narrow and high! About anhour ago she started howling again and ran down to front door at high speed banged into it and started violently scraping it. I opened it and she ran off! Not sure what to do we are exhausted and vet says just old