Here, I'll throw my $.02 out.
Instead of focusing on the
Cure, look for the
Cause, especially when it comes to the back.
Did you lift something, w/o using your legs, or did you bend at the wrong place when picking up a pen or piece of paper, or something similar?
Also look at your shoes, how you sleep, what type of pillow you use when sleeping, the chair you sit in at work, does it have some type of support for your back? all these and many more could be underlying problems for your back.
The Doc could/can prescribe pain pills and muscle relaxers, all the live long day, but it's what you're doing to your back while taking the prescriptions, that may be the underlying problem. Look at that/those and work it form there.
Yes, it does sound like you've just pulled a muscle in your back, if I would harbor a guess, I'd say it was a major pull/strain in your Trapezius muscle.
So my advice to ya Marine.....take the muscle relaxers the Doc gave ya, put on a clean pair of socks, and put on some new shoes.....then get back to work.