I adopted a cat last November. Todd is 6 1/2. In the last 10 months he has gotten sick 4 times. When sick it last 3-5 days. He usually barely eats ( few bites a day), drinks less and throws up everything until only bile comes out. The vet says little. Todd seems to get over it after several days and goes back to regular appetite and regular self. 2 out of the 4 times sick he also would pee on the carpet and that too stopped. The vet doesn't think it was an infection. I'm perplexed. Could it be serious but then why would he get better by himself ????