I recently took 250 mg of benadryl on three different occasions in a stupid attempt to get high. ever since the last time i took some, three days ago i have had pretty constant chest pains on the left side which has me worried about heart damage. also my throat will randomly start to feel constricted which will give me extreme anxiety about having a heart attack. im 16 and havent had any heart problems in the past but i am seriously worried that i have caused permanent damage or that i will have a heart attack. i was just wondering if this could be anything serious that was caused by the benadryl