I've had the classic symptoms of IBS and have been told I could have that and have also been told I'm allergic to every food under the sun. I can eat the things I'm allergic to only in small amounts - if I tip the scales then I blow up like a balloon.
You can literally see my stomach swell.

What exactly do you eat and do you get these things from a local supermarket or do you have to go to specialty stores?

I have been on a gluten free diet and boy is it tough. It can be fustrating on what things one can eat.
My main meals usually are meat/fish and potatoes/vegetables