Was your biopsy negative for everything?

Allergies can really do some strange things to you, so it is entirely possible. An allergy test is a good place start, however, much of the work falls on you. The best thing is an elimination diet. What you know you have problems with can give you a clue as what else may give you problems. Since you had a problem with quinoa, you may also have a cross-allergy with spinach or beets. Likewise, with the chia, you probably have problems with all the other grains, since they're all grasses, though amaranth is an herb, so could try that. Other common allegies are soy, nuts and eggs. Now, you may not have an allergy to anything, just intolerances, which will cause an allergy test to come up negative.