Allergic to Olive Oil?

I did a hot oil treatment to my hair this morning. Putting olive oil on the hair, then a shower cap and wrapping it up in a towel. After about 30 minutes my lips started to swell, my depression came, stomach in butterflies (anxiety), gums started to swell. I washed what I could out and ran to get my second antihistamine for the day,  Xyzal, for I had already taken my Wal-itin, a generic store brand of Claritin, about two hours before. What would have happened if I had not taken the stuff before the treatment?
I have been eating olive oil for years, and thought I could tolerate the stuff. Apparently not in this amount, in this way, on the skin.