i know exactly what you mean, i also get weird mental images that pop into my head randomly but for me it only happens when my eyes are closed. You didnt fuck up your brain, its simply hppd fucking with you and i know its hard to believe your sane with all this shit going on, but since you did get yourself checked out and they said your fine, and since i also can relate to everything your saying (mental images although i have it to a lesser extent,things moving, changed perception on the world , feeling like your going crazy, etc.) i honestly think it boils down to hppd, dr/dp and anxiety. Keep in mind hppd comes in all shapes and sizes, some people may have stronger visuals, while some people may have very little visuals and a lot more mental aspects of it. I obviously dont know what is best for you (i.e if you should take medication or not). I found that medication didnt help me at all but it changes between person to person, but remember counseling may help. If you do decide to take medication you will probably be prescribed either an SSRI or an antipsychotic, SSRI's have been shown to help about 50% of people with hppd but the other 50% of people who took it, it made there hppd worse. Antipsycotics however had mostly negative effects on hppd. I tried Antipsycotics (Seroquel) and SSRI's (Prozac)for both my hppd and my severe anxiety and found that seroquel made my hppd and anxiety quite worse and prozac had no real changes on either, these are just my personal experiences, talk to your doctor and do your research before taking any medication. Remember your not crazy its all your hppd, anxiety and dp/dr.