Heartburn was a symptom I thought was because of stress....not...it was an allergy. Amongst other but this one floored me. Weird

Dry hair and brittle nails

Not necessarily a symptom, but being an outlier. Unable to have foods that other people with similar issues can have. Trying treatments that work for other people, but having it make things worse for me.

How it affects mental health directly, when my husband (Celiac) gets glutened one of the first indications is severe parany and anxiety.

Before being diagnosed, the feelings and symptoms of having a hangover when I didn't drink ie. nausea/vomiting, sinus pressure and pressure in my face, feeling out of it and lethargic.