Wow. Ok, for the past month or so i've been getting these weird "headaches".  Then just last weekend, i had one so bad it felt like my head would literally explode.  There was an extremely loud noise inside my head, my heart was racing, and i could barely breath.  When it first happened i thought it was Judgement Day or something.  I ran outside expecting to see the sky falling, then realized it was in my head.  I've been trying to figure out what it was.  I thought i was having an aneurysm, or stroke, or had brain cancer.  I, or someone similar, had been smoking DMT rather heavily (1 to 2 grams per week on average), and i was afraid i was losing my mind.  That's a relief.