On four occasions this winter, after being out in public(malls, restaurants), the next late morning I experienced sudden stomach cramps, gagging, intense sweating, and fatigue. Usually after sleeping(sometimes in as little as four hours), I would feel fine, appetite good, very little residue effects-what gives(I am a 65 year old male in good health-taking no medications and see my Doctor every three months for arthritis? My email is YYYY@YYYY