For anaphylactic shock you would be dead before benadryl has an effect which takes thirty minutes. If you are allergic to bee stings or anything else that puts you at risk for anaphylaxis, then epinephrine should be in your kit. I would also want something to attempt to stop an arterial bleed from doing me in, like a maxi pad or something else absorbant that can quickly be placed with pressure over a major wound.