My 8 Year Old Cat Has High Blood Levels, Possibly

My 8 year old cat has high blood levels, possibly indicating Pancreatiitis. First my vet recommented, "Pepcid AC" for humans. I did some research and found that was not a good idea. Now she recommending "sucralsate". He already been put on a special digestive diet, also taking Laxatone for hair balls. He had intestional surgery on 12/24/15 to remove a hairball blockage, there after being put on special perscription diet.
After doing research, it seems a high quality probiotic is recommended. What is your suggestions on what direction I should go with. I tend to natural products may be a better solution? Look forward to your response at YYYY@YYYY

Thanks ~;')