It seems that when I eat some foods, I instantly feel unwell. I feel sick,have increased saliva production, my stomach churns, I burp a lot, feel like I'm drunk, my head feels spaced out, my speech slurs, my throat feels swollen and constricted, and I just feel awful. Just now I had a little bit of gluten free jaffa cake and gluten free maderia (tiniest bits) and instantly felt awful. Afterwards I feel drowsy. It can last from minutes up to an hour. Any ideas please.