I sat in class for like 8 hrs straight the last few days, was not running so much and my legs have been numb and tingly for like 3 days since. i figured no biggie for a few days but now more concerned. actually as I think about this has been going on for about a year off and on. my legs are not weak, I have no loss of sensation or pain anywhere just the tingling like they are going to sleep. please help.