I do not know what your situation is. I've read about people who feel their heart chakra opening for the first time, scared to death that they are having a heart attack, same thing for those who experience the OOBE vibrations running up & down their body. Could it be possible that sometimes when one suddenly becomes in tune & aware to their energy body on a gross scale, they could mistake it for a serious health crises? If this is the case, just relax, give in to the feeling - even if it leads to death, be willing to die & surrender. Sacrifice self, & see what's on the other side. I'd rather die struggling to achieve awareness, then live life having run in fear from it.
Then again, it could be just a medical condition.
Or maybe a combination, maybe the drug is forcing your premature awakening/awareness, like LSD or shrooms. Who knows?