So I woke up like three hours ago, at 11 a.m., and since then I've had about ten episodes of what I'll call "head rushes". It happens when I stand up from sitting on the floor (we have like no furniture in our house), and my vision will almost completely black out, and my brain is covered with a warm fuzzy feeling. I haven't ingested any psychotropic substances for like three days, and even then it was only weed. I hope I don't pass out or anything.... Does anyone know what the reason for this could be?