I've gotten hit by them in the past while bush hogging... the most painful was 2 stings right on the top of my ear... hurt like #&!! for 2 days and nothing would take the pain away. I am not allergic, but hear that many have not had a reaction and then all of a sudden they will. Since I am often working alone in remote areas, I was thinking about asking my Dr. for a epi pen prescription... just to have one available in case I did have a bad reaction. Has anyone done this before, and what is the shelf life on an epi pen?