What I am feeling is very hard to describe, I have been dealing with this off and on for many, many years and no doctor can figure it out. My condition starts when I eat (Please note: It only happens by chance or randomly not everyday or every week but if it happens one morning it will affect all of my meals that day). The symptoms start in my head and move down through the rest of my body. My eyes become red, my blood pressure drops, my heart beats erratically, I become hot, there is pressure around my nasal area, my parotid gland protrudes, I must lay flat otherwise I will pass out, then i will have extreme diarrhea. If you have any suggestions or anything please help me out.