My daughter has the same problem! She's been trying to figure out what's wrong with her for quite awhile (she also still has bad pain, even though she just had her gall bladder out about 6 weeks ago.) Sometimes it seems food-connected, other times not. But she's had the bad gas for years. Strange.
...fibromyalgia, hearing loss, elevated liver enzymes, skin grafting (back), arthritis, scoliosis, lumbar disc damage, sciatica, IBS, migraines, tachycardia, cancer surgeries (face).......I take Nortriptyline & Clonopin daily, and Darvocet as needed