I had the same problem for awhile. I was allergic to avacados, melons, bannanas, tomatos, I couldn't eat them. My throad would start itching and swell up. They say you allergies change every 7 years but it took about 14 years for me, and I can eat all of the above with no problem. I probably eat 2 avacados a day right now, most are grown in cali and they are cheap here.
I can't do Avocado or guacamole or fresh melons, I'll spew. My cauliflower and broccoli has to be cooked or smothered in dressing for the same reason. Everything else in that list I can deal with in big heaps.