I'm so sorry to hear about your struggles. After many months of increasing brain fog / sinus flare ups / gut pain / energy loss I went to the doc and discovered I have food allergies. This is a relatively new thing for me, and I know nothing about leaky gut (in fact I came across this thread via a google search trying to learn about it to see if that might be part of my issue). However, I have been working to learn about nutrition for several years, so I know a good bit about food. That's where I'm coming from with this post.
I also want to commend you for pushing forward with life. I am sure the stress/anxiety you are experiencing must make going to school and work difficult. Hang in there. There is an answer. You're just in the middle of the path to finding it.
A few observations that might help your food choices...
Quinoa. In your earlier posts you mentioned eliminating quinoa. Please note that it's not a grain. It's a member of the spinach family. Since it's loaded with protein and all the amino acids your body needs to build muscle, I'd think it'd be a great add in!... unless there's another reason you eliminated it that I didn't catch? If you can eat it, a quick/yummy breakfast is fried eggs (I fry mine in coconut oil) on top of quinoa.
Hummus. It's main ingredient is chick peas / garbanzos (just smashed up). Since you eliminated chick peas wanted to make sure you knew that!
Peanuts - Peanuts are not a nut. They are a legume (bean family), so your body processes them differently than nuts, like almonds/walnuts, etc. I understand you are also considering elminating nuts, but I just wanted to clarify that one option would be to try eliminating peanuts and trying other nut-based foods, like almond butter. Nuts have good fats in them for you, so if they don't cause a problem, that might help your weight gain, too.
Meat - I read that you buy organic food, but I didn't see any mention of what feed the meat has been given. For example, cows were meant to eat grass, but even organic farmers often supplement their feed with grains to improve flavor and texture. Grass-fed beef is a much better choice because it doesn't cause inflammation, and some people with grain intolerances have issues with animals that have been fed grain. The same is true for other animal products, including eggs. Let me know if you need more info on this, and I'll look up some links.
Lemons - if you can, drink lots of lemon water. It cleans your body and makes your blood alkaline, which helps fight infection.
A book that might be helpful is the PH Miracle (and the associated books by the same author). Don't let the fact that one of the books is called "PH Miracle for weight loss" scare you. It's not a diet. That's just marketed to overweight people whose bodies will naturally lose weight as they start eating well. One point to note is that they promote soy use. Most soy is highly genetically modified and causes health problems, so I only use non-GMO soy products (like Bragg's liquid aminos - soy sauce alternate and great flavor/sodium add with lots of amino acids!)
A podcast/website I just came across that has some great meal ideas is the Raw Chef. Maybe he will help you come up with some new ideas? (therawchef.com)
Finally, do you practice any sort of religious activities? It's the best thing I've found to counter anxiety. Saying a prayer for you now...