I think that as we get older our bodies start reacting differently to food, and it just might mean that you have to change the way you eat. It depends on your daily activities however, on weeks you know that you don't have to be sitting in a silent room, you can eat w/e you want. However if you have classes or are involved with something that you think the symptoms could make an embarresing situation, then you have to change your diet habits.
Anyways, i'm becoming more and more convinced that it is the simple carb maltodextrin found in most processed foods that give me my symptoms. My diet to get around this consists of eating the following in large quantaties: rice, potato, corn, oatmeal, eggs, chicken (no pre-made seasoning), steak (no pre-made seasoning), grits, protien powder, tuna, fruits, milk (not 100% sure on that one), and veggies.
Now after about a week of eating just those foods my body allows me to have little bits of malto here and there, but if I have to much then I have to stay clean for another week or so. The diet I use isn't the easiest or the most tasty diet ever, but it seems to have helped.
I still try and stay away from breads and wheat when i'm feeling really sick as it seems that I might be slightly gluten sensitive as well.
Sorry that you all have to go through this, I know it sucks, i'm actually pretty sick right now as I have been straying away from my diet due to the summer time, but now it's time to go back to school so i'm sucking it up and eating right. Goodluck!