Your situation sounds trying – I’m sorry to hear about it (it’s been interesting to follow the discussion), and I hope you can work with the GI and nutritionist to find a varied, balanced diet and maybe even resolve underlying issues such that you could more easily eat more of these foods! Meanwhile… I’m brainstorming a few ideas… hopefully not repeating too many things.
Grilled salmon covered in a mountain of raw finely chopped tomato, pineapple and cilantro next to some plain or lightly salted/oiled rice (just had it yesterday here in a restaurant in Mexico – YUM)—if you can’t eat the pineapple and cilantro (wasn’t sure), replace with other sweet fruits you can eat and/or another herb, or maybe try salmon with berries? (never have, but I think it could work)
If you’re ok with herbs and spices in general, that could be a great way to make more (at least SEEMING) variety in your diet: mint, dill, parsley, etc all give a really different feel to the simplest things – like rice or yogurt. Scrambled eggs or an omelette-type thing with chopped parsley is very good. Anise, garlic, rosemary, cinnamon, nutmeg, basil, ... just changes lots of dishes when you have to repeat the more substantial ingredients. (And could lead to many more recipes from me.)
Since you can eat the inside of sweet potatoes, I’d go crazy on that – they’re so tasty, versatile, and super nutritionally-speaking (one of the most complete foods on earth!). Pureed as soup (alone or with pear or cinnamon or other mild hints of something), baked whole (then peeled), baked as fries, added into a stir-fry on pasta or rice…. etc.
What about coconut milk? Great for curries, soups, sauces.
Since you’re cutting down on dairy, seems like rice milk and almond milk might make good substitutes for cow milk. (I use almond milk for everything!)
I know this is an obvious one, but since you’ve got eggplant, tomatoes, eggs, flour products (would that include bread crumbs?), and rice all on the list, I’d eat eggplant parmesan like it was my job.
How about sprouts? They’re easily to grow at home, very nutritious, and could add that crunch you might wanting in place of lettuce for some dishes. Wheatberry (sweeter), alfalfa, and lentil are easy and simple (I wonder if that would make the lentil digestible for you? It’d be worth checking out), and broccoli seeds are a little spicy.
Homemade smoothies with berries, nuts/nut powders/protein powders, almond milk, yogurt, etc. (Blenders are awesome, but just FYI the Magic Bullet is really handy for individual use like this—my grandma makes herself a frozen berry, protein powder, any milk, ground flax seed smoothie every morning!)
Can you eat citrus fruits like orange and lemon? That would open a lot of ideas.
Can you eat ginger? (ginger lemonade! ginger is great in so many things…)
Can you eat fennel root? (great sliced, baked, and seasoned with salt/pepper and lemon – also in stir-fries and surely other ways)
Can you eat miso? Soy, but a great way to get live enzymes, a very different flavor, a base for soups (say with carrots, rice).
Celery?
Honey?
Cherries?
Beets? (AMAZING for you)
Vinegars?
Mushrooms?
These would lead to many more recipes.
Ok, I think that’s enough for now! Wow, that got longer than I expected!