I feel that pain, sister. When I started the whole thing for the first time, it was pain and misery all the way for my poor tummy. I made the classic mistake of excessive protein intake, only huge amounts of low calorie, high-fibre foods. Man it was hell. I really did look 7-8 months pregnant, I was super gassy, bloated and miserable and I thought that I was doing the right thing and being healthy… So what helped for me?
When I finally accepted that I needed to change the kind of foods that I eat, it got a little better. I still need to avoid large amounts of beans/legumes, wheat and other gluten containing grains and milk. And I am SO SORRY for this, as I would love to eat all of those things a lot… So I use soy milk and non-dairy alternatives to many of my foods, still eating cheese, some yoghurt, ice cream and quark though. It is not so bad if it has some good bacteria cultures. Also, I use a
probiotic capsules and those have improved my stomach and digestion a lot.
Also, choosing rice and rice based pasta and bread, as rice is more gentle to digest. Oatmeal actually helped too, even if it has a high fiber content. I read somewhere that oatmeal creates a protecting layer inside your stomach and so it's easy on it. I'm not cheering for gluten-free products IF YOU DON'T HAVE REAL PROBLEMS TO DIGEST IT. I don't have Celiacs disease but I am intolerant to big amounts of gluten. Probiotics and gluten-ease capsules help a bit so I can have my regular pizza and cake every now and then and have a proper feast at parties
Listening to my own body was also important. When I found courage to give in to my cravings (easy digesting junk food and fast calories) I started eating more of the things I needed to be eating. So don't be scared! It does get better with time and food and consistent effort.
Oh btw, I do know that if you also have had bulimia/bulimic tendencies, your digestion may need even more time to recover and get used to food again. So be extra kind and patient with yourself if you used to purge. If you still purge, try your hardest to stop it now. It will only worsen the symptoms of digestion problems and make things harder to heal mentally and physically.