I too have trouble with all vitamins, medications and cheese. I have been doing research about "tannin" allergy and it seems to fit me. Tannin is a plant phyenol (my spelling is poor) I noted that cellulose is made from plants. I have trouble with fruit juices, (high in tannin) cheese (ananto - tannin) Tea, coffee, wine, grapes, berries, black beans, soybeans...
I used to wake up and see a bird hovering over me. My heart would race and I would be confused for a bit. It wasn't a bird, but our ceiling fan!! Doesn't happen anymore... Isn't that interesting???
Extreme fatigue and sleepiness can be caused by low blood pressure. My doctor called it "dumping". Food passes too quickly through the small intestine, which in turns causes the blood pressure to drop. A change in 10 points in pressure can cause symptoms. So if you are normally 110/70 and drop to 105/60 you may have symtoms.
I would get faint, have black...
I have had a problem with bad breath for years, and yes, I believe it is associated with "gluten". I hope your wife is feeling better and no longer has this problem.