Luv4Asian8's case sound much more like over exertion than an injury. Like several have said, stretching, moderate exercise, and rest should have it better is a day or two. Alternating heat and ice might make it feel better. I've used that technique on sprains...it speeds the heeling...ice reduces swelling and heat (only after the first couple of days) encourages good blood flow to promote healing.
Disclaimer: I'm NOT a doctor
