sick chocolate lab

[KIMMCCLURE]

I hope there is someone out there who can help me. I have a 2 yr old choc.lab who has been sick on and off since January. It started out with him waking up btwn 2 and 5 am vomiting bile.Afterwards his stomach would just gurggle and churn and he wouldnt eat for hours.When he did eat he was verrrrry gassy!! This went on for a few weeks every couple of days or so- the Veterinarian prescribed him something to settle his stomach, that really didnt work. We ended up getting xrays, blood work for IBD and check diff levels in his blood all of which was negative/normal,with the exception of gas in his intestinal tract and an antibiotic was given. Here we are still with the same problems- even tried Zantac- he didnt throw up the bile for almost a week.. But he has such SMELLY gas and is eating grass alot and throwng up. He will eat any foreign object he can find which does attribute to some of the vomiting... We switched food from Purina Pro Plan to Eukanuba (dry...) He is steady gaining weight he is 93 lbs... His coat is beautiful and he is hapy for the most part... until he gets sick and then he is up pacing and wining unil he goes outside to relieve himself. He has had two tarry stools in the last month but for he most part he has solid stool. Does anyone have any suggestions on what I should do next???