So today i was walking around, getting my daily exercise, and something odd happened, my vision started going odd on me. It was like my vision was pulsing in front of my eyes, i was looking at the fence in my yard and it was as though it was zooming in and out on me while i was standing still. It was about 100 degrees out (i know i probably shouldn't have been out) and i had been walking for about 12 minutes. Has anyone else had this happen to them? I went inside and relaxed a little and it went away, leaving me looking grey, feeling tired, and maybe a little dizzy, but that passed too, and now i just have a mild headache. Is this just a normal, pushed it too hard, mini crash of sorts? Ive only been sick 3 years this july and the range of symptoms still gets me. Also i have been weening myself off about 120mgs of codeine, so maybe that had something to do with it? Thanks all.