So I've been hallucinating for about a month and a half without the aid of substances, and I've been having a three week long headache to go with it. I've been describing the hallucinations to my doctor, and finally he tells me "They're not psychiatric in nature. They're organic. Essentially, they're either caused by lingering chemical activity from hard drugs, or a mass in your brain." Hard drugs meaning; PCP, crystal meth, mushrooms, acid...the fun stuff. Stuff I've never done. So I'm stuck thinking I have a mass in my brain for the past few days, either a tumor or an aneurism. I try to stay positive, as the headaches aren't severe, and my doctor doesn't seem to think I have a mass. Anyway, I schedule an MRI for this friday at 10:45 AM. This morning I wake up from a horrible nightmare and have a very sharp pain in the top of my head, as opposed to the general dull pain all over my head that's been going on for the past few weeks. The pain increases in severity for about 15 minutes, then goes away for a few hours and comes back, only to build up again and leave. I go to the ER and tell them what's going on, and get an emergency MRI as well as some bloodwork. They test me for drugs via blood and urine, then send me into the massive magnetic chamber. I wait for 5 hours total to find out nothing is physically wrong with me. I'm told I'm not hallucinating, that the things I'm seeing are peculiarities in my sight that have suddenly occurred. This doesn't explain the waves of color I see when I close my eyes, the people and shapes I've seen in my peripheral vision, the shadows that gather in my room when I turn off the lights (I can no longer sit alone in a dark room), or the fucking squirrel I saw running around on my girlfriend's wall that turned out to be a damned dream catcher. I'm apparently not seeing any of this. The headache I can deal with, I've had migraines before and the current aches aren't really much compared to what I've experienced, except they don't lessen in severity with painkillers. So, either I have something wrong with me that can't be tested for yet, or everything I see is real.