TweetMan, man, man that sucks.
Even if you do have a bulging disk they won't be able to tell you if that is what is causing the pain, because some people are born with abnormal bulges in the disc and it is completely normal.
don't have surgery.....unless you start to not be able to get out of bed.
don't do cortisone (spelling?) shot - feels good for about 3 to 4 days then hurts worse.
It could be torn tendons. I think that is what mine was just because I know what it felt like. (If you think this might be what yours is and still experiencing pain in a couple months do a search on keyword: prolotherapy)
I tore up my back 3 years ago (october 99), on Leg press. It hurt everyday up until the beginning of this year (Febuary 03). Now just every once in a while. I was 23 at the time.
Not trying to scare - just givin some info......Good luck.