With all due respect to Mike (who couldn't make it thru 1/2 hour of the Astanga class I take), I think you'll find plenty of good yoga schools in Jersey. I would look specifically for a place that teaches Anusara style. It's very exacting, and it will help you find the specific muscle groups that need attention. You could consider Astanga (a more athletic and intense workout) but it's pretty strenuous, and might waste a tight homeboy like you!
The roller thing that Joe suggested is helpful. I've used it in the past, but it's pretty uncomfortable (and ultimately it only treats the symtom, not the cause). I would also say that running off to the doctor and dropping a few hundred dollars is something of a last resort. *$#%&-doctors are just going to write you a prescription for some high dose of motrin and tell you to run less; or worse, send you off to a specialist to pay 5x the regular doctors rate for a stronger Rx and a technical but useless diagnosis. We all know the problem--you're tight and your muscles are out of balance from doing the same thing over and over (running).
Get yourself to a yoga class twice a week and the problem will be solved. You'll also find yourself climbing a grade harder to boot.
Michael, whenever you're ready, you can join me for Astanga class at 71 Main. I'll pay your way!
BTW: Rotated side angle: Start in a lunge with your right foot forward, knee directly over ankle, knee at 90 degrees. Left leg with straight knee behind you, ball of left foot on floor, heel in the air. Put your hands in prayer at your chest, rotate at your torso to the right, so that your left upper arm comes to the outside of your right knee. Press your right palm into your left, and remember to keep back of the left knee straight, strong and reaching toward the ceiling. As you get looser, you can try putting your left palm down on the floor next to your right foot, and reaching the right arm up towards the ceiling.
You might also want to incorporate some of the streches shown here. If they feel hard to your, they're probably ones you need to do: gunks yoga article