When I lay down a certain way, or hang with my legs dangling after doing pull ups. Once I try to stand up or put any type of downward pressure on my lower back I get the most painfully sensation almost like a pinched nerve In my lower back but after I relax for 15 min or so it goes away, the pain is right in the spinal area and it's been occurring over a 6 month period, any suggestions on what to do because doctor thinks its no big deal?