My cat 11 years old started throwing up white foam about couple months ago it went from throwing up once a week to throwing up every day. Had all the bloodwork done which came back normal. He also had Cerenia and fluid injections plus got a shot od Depo couple weeks ago. Vet said its either IBD or lymphoma.So far there isnt much improvent he eats very little, lost weight , mostly sleeping not much energy. Has anyone had that experience? How long does it take for cat to feel better if it is IBD?