Okay im not sure if this is the right place to post this ive never posted anything before. About 6 hours ago i shot one bag of heroin into the crook of my arm. My hand IMMEDIATELY burned like hell. I pushed the plunger down so quick the entire shot got in. About 30 seconds later my hand swelled up and hives were all on the underside of my forearm. About 10 minutes later the swelling was much better and the hives were just about gone. I took a benadryl thinking i had an allergic reactiin to a cut in the dope. I didnt feel very high but my pupils were smaller. Now, 6 hours later my hand still hurts and noticeably swollen. I canfeel a pulse at the injection site. So ive done some research and my question is did i hit an artery? If so what should i do? Ive shot up in this arm literally thousands of times but i shot a little below where the scar is. Im really nervous please help!!