What I advise with pain is:
Don't run through it.
Do a good Google and have a read. Here is an article by Josh Clark on Cool Running's web site on back pain, it looks pretty authoritative.
If you're at a gym, talk to someone there who knows about things.
If you have an independent running shop near to you, go and talk to them. They may do a gait analysis and advise on corrective shoes. If you feel you're being ripped off though, then go somewhere else! Most people seem to get more joy from small independent outlets.
If you can easily, talk to your doctor.
I hope that is of some help!
I'd suggest using Google to find some stretches you feel comfortable with. There are tons of reputable sites with great descriptions and images, from what I can see.