Well baked beans are majorly gassy for me - I can't eat them at all now. Pickles, shredded carrot, appleas and soy cheese are also all triggers for me.
And it doesn't sound like you're eating very often at all! For safety, you should be eating something SF every 2-3 hours.
The trick with Immodium as a preventative is to take a low enough dose. If even 1/2 a tablet once a day makes you C, then you can get the drug (loperamide) on rx in liquid form to allow you to take teeny amounts. I have to say, I do recommend it.
If you're on Prevacid, you shouldn't really be drinking peppermint tea!
Have you tried narcotics like codeine for the pain?