Eating Raw Onions Gives Me A Headache. I Work At

Eating raw onions gives me a headache. I work at a medical lab and have free access to lab testing, including an onion allergy test (IGE), but I'm not sure that an allergy would have any correlation to a headache. I've read some things about tyramine, but am not sure about that either. Would you suggest having the allergy test run?