Wow, I was planning to post a similar question in here today...my back has been killing me...in a similar spot...just under the shoulder blades. I only just got a new bra (a maternity one) and this afternoon I wondered if that's what could be causing the problem...I've since taken it off and my back does feel better?!?! I don't know how long for or if that's the real reason or not but I know I can't go without a bra during the day at work. At least I can try it over the weekend and see how I'm feeling tomorrow night.

Thanks for the tips girls...I might try the tennis ball thing too!