Apparently a person can develop an allergy to nuts/nut products/seeds at any point in their life.
I finally figured out why over the past few days my tongue kept swelling and throat felt tight, and I would wake up with a headache after falling asleep. Other things happened too but they could have been coincidental to just having those symptoms. Yesterday I took some benadryl and it helped a lot to unswell my tongue and throat. Finally. Took it again today. So I am now having to avoid so much food; (almost all of) my food contains nuts, seeds, or contains nut products, or are plain nuts. I LOVE nuts. I cant eat peanut butter even. I have so much peanut butter stocked up idk what to do with it all. There is so much food to get rid of. I'll probably give the unopened things to a local food bank, otherwise I guess if my parents want the food then it is theirs.
The DR knows my tongue has been swollen, but it was my mother that said it might be an allergy, and she was right. After I cut out the nuts etc, then reintroduced them, it was obvious.