Hoping the OP is okay and went to the doc by now, but just had some more info I figured I'd post.
This situation reminds me of the first time one of my friends went into convulsions and a seizure when I was at college after he smoked some of fake weed(syncans), while we were all smoking weed, drinking underage, and snorting coke. Everyone was all scared to call for help because they were more worried about getting in legal trouble then making sure our friend was okay. I was the one who called it in and before EMT and the police showed up, everyone scattered, I was the only one that stayed to make sure he didn't die before they got there. While EMT was getting him out of the dorm and into the ambulance, a medic asked me what all he had taken, while everything illegal was still sitting out. I was scared as shit and didn't want to talk much a first, then a cop came over told me "you're not going to jail, you won't get any tickets, or any charges; we just need to know to treat him properly." I complied and told them the full situation. After the ambulance left and only the cop was still there, I came up and thanked him for being cool about everything. He then informed me that no matter what an officer runs into on a drug overdose call,they can not charge the user or anyone else present with whatever is there. This is because if anything like my situation ever happens again(which is did, many times), they don't want whoever is calling to not call because of what happened the last time they did.
Basically, if there is a serious health concern from drugs and you need medical attention, you're pretty much granted legal immunity for the call.