HI, Here's A Tough One That Nobody Can Answer. I

HI, Here's a tough one that nobody can answer. I suffer from constant anxiety for numerous reason and for many years but I notice a strong feeling of calmness and euphoria right before having to make a bowel movement which turns quickly to the same old negative thinking and anxiety soon after. I have never taking any medication for the anxiety what so ever. I wish I could feel the way I do before a bowel movement all the time. Chemical imbalance?