Sadly, LPR, and GERD, can all be problems evolving from use of our antidepressants. Gastritis and other GI problems can be infrequent side effects from these medications.
They can also be caused by smoking, overeating, overweight, inactivity, and overindulgence of alcohol.
Best wishes on the follow-up with the Gastroenterologist, and the withdrawal from Cymbalta. I hope all goes well, with your Psych follow-up in finding a new balance also.