Congrats for cutting foods that can irritate the gut! That's a success in itself. And if your antidepressants are tricyclic, then that is said to help reduce belly pain along with anxiety and depression.
Have you talked to your doctors about a different medication such as Eluxadoline, this signals your nervous system to help stop bowel spasms. It can also ease belly cramps and diarrhea. or Rifaximin which is an antibiotic that changes the amount of bacteria in your intestines?