I decided test my tolerance to peanut butter again today. As mentioned before I acquire a headache and sore/tight throat every time.
My suspicions were correct. I might indeed be allergic to peanut butter, but when did this happen? I never had a problem before.
Or at least these symptoms never appeared.
However, now that I think about it, when I got hired at a new job in August, I would eat peanuts and peanut butter stuffed cheese crackers for snacks nearly everyday.
This is also around the time frame in which The O-dore re-spawned, but to a lesser degree.