I get those head rushes from time to time when I get up from laying down... Cant really remember when it started, but it was before I smoked. I'm in the best shape of myself, very athletic, low heart rate when I'm idle, but I still get those head rushes..

I've never lost complete sight from smoking, but there was one time it got very fuzzy and I needed to sit for 5. It went away and never came back.

In my opinion, if you wanted to continue smoking just do it in moderation. Instead of getting really stoned, just get a bit high ... if that makes sense haha. IE avoid gravities. You could also choose a mellow strain, with a low % of sativa.