I'm 15 and lately I have had this deep out-of-it feeling. It's weird to describe but I feel like I could be losing oxygen because my eyes begin to strain and I can't focus on anything. They turn bloodshot. I get tired very easy when I do mental activities .. such as computer gaming, reading, and watching movies. I spend a good amount of time on my computer daily.. and was wondering if that could be it. Also, I was wondering if this could be some kind of withdrawal from minor alcohol and marijuana use from a near previous time. I feel so unlike myself.. I stop and stand still and look around with my eyes and everything feels so different. Its so hard to explain. Objects are blurry and I can't keep my mind focused on more than one thing. For instance, I play guitar. When I play now I zone deep into it and when I stop to look up.. This out of it feeling begins. It also comes up after I wake up or like 30 minutes after I get out of a refreshing shower. I'm dealing with stress too.. =(