Suggest Treatment For Side Effects Of Depression Medication

I am on a lot of medication for depression and anxiety (tricyclics and benzodiapenes). I have been doing very well until I started to develop very bad reflux. I can t change the medications I am on--I am extremely sensitive to medications and have had horrible experiences with over 14 meds for depression. I started zantac 10 days ago and it worked great and I felt really good. In the past 3 days I am having severe nausea, 1 or 2 panic attacks, and diarrhea. Is there another H2 blocker that I should try or should I take half of the 75 mgs of zantac? Thanks for your help.