It's hard to know when to seek professional help and when to problem solve on your own. You could start with some things on your own and then see what clears up and what doesn't, and then decide if you want to experiment on your own more or go see someone already knowing a bit more about yourself. I've gotten important help from healthcare providers, but I've learned a lot on my own too.Â
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If you want to start on your own... most people seem to have food intolerances, sometimes it's simple and just a few of the common ones, sometimes the list is long. If you want to eliminate some foods, I'd start with gluten, dairy and soy. Seems like a lot at first, and it'll obviously mean a whole lot of home cooking and very little convenience, but with some practice and some meal ideas, it can work. But I'd hope to start seeing some changes if you do that, and then if symptoms come and go, you can start journalling and see if other foods stand out. Testing can be really helpful if you have a long list of foods, but it's not uncommon to see good results by just taking out some of the most common allergens--so the choice is yours (other folks have ideas on how to test for intolerances, which are more common than traditional IgE allergens and your symptoms certainly could be consistent with intolerances).
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You've got enough digestive issues, I'd wonder about celiac. Do other people in your family have as many digestive issues as you do? Anyone with autoimmune stuff--type 1 diabetes, rheumatoid arthritis, autoimmune hypothyroid, something else? But even if it's not celiac, gluten is just weird stuff, it does a wide variety of weird stuff to people. We're all intolerant (I mean me, DH and the 2 kids), with a variety of symptoms, but not celiac (I could tell just by symptoms, we haven't tested).Â
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If/when you want to cut out soda, consider really upping your fat intake, and maybe your protein too, and keep snacks close by, I used nuts for that. That often seems to help when people cut sugary things. And it may be a LOT of fat--I made snacks heavy on the coconut oil, and I also used meat to help with that--there are vegetarians around on the board, and there's a long thread in the Vegetarian forum that's vegan and gluten free, at least 3 pages, and that would have more ideas than I do.Â
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At some point, consider a probiotic, either a supplement or fermented vegetables. Homemade sauerkraut and kimchee are really easy, we love kimchee. Yum, and I can see it help my DD's digestion.Â