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That's exactly how mine started. I had smoked pot several times during a summer, and all of a sudden one day I just felt this weird pressure in my head. I looked it up online and determined that it was a tension headache, but I also experienced the vision symptoms as well. I figured that it may not be tension headaches after all because I just plain felt weird. After a while, I stumbled upon the term depersonalization disorder and realized that it was exactly what I had. I know what you mean about the closed feeling.. it never really went away fully but after about a year I got over it. I'm sorry to hear that yours seems much more permanent.