My 1.3yo has been throwing up about once a week since last August. It is within minutes of eating and the food comes back completely undigested just as it went in. There have been a few weeks when he would throw up a few times within a week, and he has gone 2 weeks a few times without throwing up. He does eat much faster than his brother, and just a more anxious cat. I feed them 1 can of wet food 4 x a day. No dry food. He was on blue buffalo chicken kitten when this started. Switched to wellness kitten chicken. Since then tried Instinct LID rabbit, duck, turkey, Feline Naturals Chicken and Venison, Almo shredded chicken and carrots, Almo shredded chicken and duck, Rawz shredded chicken and duck. He threw up from all different foods, so don't think it is food allergy. I also give 5-6 greenies a day. I just ordered a raised feeding bowl to try if it would help. 3 weeks ago he started licking walls, mostly at night. I googled and concerned about it being something serious, and not just behavioral. Saw a vet 2 weeks ago for an annual check up. She wasn't concerned about it being anything serious since he looks healthy and acts normal otherwise. She suggested 1/4 pill of pepcid in the morning. We just started a few days ago, but he threw up anyway and has been licking the wall a bit. I also noticed he has been licking his lips the past 2 days. Any advice? I'm worried about him being ok!