Was diagnosed with flu type A toadstool and given medications. Was told to take Benadryl as an anti-histamine. Took one with other meds, about an hour later noticed red, itchy bloches all over body & took another Benadryl and another An hour later. Still feel weird, can I take another one without doing more harm? Have taken4 Benadryl in the last 5 1/2 hours?