Hi, Jan, and welcome.
I wish I could help you, but I am a mess myself as far as diets go. I went gluten free for a few weeks (I realize this isn't identical to what you did) and all it did was constipate me, big time! Now I'm sort of following an irritable bowel syndrome diet. It's gotten to the point where I don't know what the heck to eat! So, if you find that this works well for you, I'd love to hear about it.
Years ago, I was going to a Chinese Medicine doctor. For 8 weeks, I ate: steamed brown rice, steamed veggies (any,) hard-boiled eggs, bananas, and canned pineapple. Oh, and baked chicken breasts (not much because I'm generally a veggetarian.) As much of these as I wanted. And only water to drink...
My digestive system felt better, but the fibro pain was unaffected. And I lost about 15 lbs. which I didn't really want to do. So that was the end of that.
This too shall pass...
.......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