Yeah the worst unreality feeling I had was when I was playing Halo 2 online, it's hard to describe but it wasn't too good. It'll take you awhile to really get over the panic attacks, so give it a few months. Just rationalize things and realize that your unreality feelings are merely panic attacks, and it's your body's way of telling you that you need to do healthier things. People were not meant to spend too much time inside and stare at TVs and whatnot all the time. Get out and you will be fine.