Could this be a peanut allergy?
OK so I have started eating almonds and cashews lately, which I've never really done much of in the past. I have snacked on them a lot this previous week, and for the past three days now I've been experiencing what I thought was some stomach virus. It started with just a general nausea, followed by painful bloating and upset stomach to the point where I didn't want to eat anything at all and stayed in bed most of yesterday. Usually with a virus, I would be achy and feverish, and I've experienced neither. I have felt hot and somewhat lightheaded, but no fever whatsoever.
Now, I always thought peanut allergies meant throat closing, can't breathe, itching, etc.. Is there another form more like what I'm experiencing? The reason I'm wondering about nuts now is because not long ago, I had an upset stomach again, and basically passed a substantial amount of them that were fairly intact (sorry, I know it's gross). Maybe I didn't chew well enough or something, I don't know, but that surely wouldn't cause me such sickness.
Also, I always enjoyed peanut butter as a child and never had any problems with it. I'm now 22. Is it possible to develop an allergy after this many years?