Several Years Ago I Was At A Mexican Restaurant And

Several years ago I was at a Mexican restaurant and ate queso dip. The right side of my face and ear started to swell some and started getting so hot! I stopped eating the dip and it went away. A few weeks ago I ate a few peanuts and the same thing happened but with more intensity. Tonight I had two cheese and crackers and the same thing happened!! All of these things I have eaten lots of times with no reactions. What is the deal? Why reactions sometimes and not the others? Should I go have an allergy test performed?