Imipramine / tofranil after DS help!

Hi! I had my surgery back in 2008. This last year, I made some changes to my diet that my stomach did not agree with and now in order to keep it from hurting, I have to take ipramine.(I tried to date a vegan and we ate a lot of veggies that apparently I can't eat over time.) Now, It slows the motility of my intestines. Which kind of defeats the purpose of the DS. I'm having a lot of trouble losing weight because at the same time my thyroid also starting having issues.

Now it seems like when I drink my protein shakes I absorb 100% of it, when I'm eating meats and protein, it slows my digestion and I no longer have loose poops. The problem is I'm almost feeling constipated and even though I drink heavy cream and take butter and use olive oil, nothing is providing the same evacuation as before I had the medicine. Sugar just gives me painful gas.
I tried to come off the med a couple times but I absolutely can't stand the pain.
Anyone have any experience with this drug? I'd really love to talk to a doctor about the scientific parts of it, but I had my surgery with Laparoscopic Associates in San Jose and they are closed now. I don't' know who to contact.
I appreciate any help or advice!