I agree with above. No quick cure. Just ice, anti-inflammatories and rest. With college season coming up, no reason to chance it. I will say, for a broken bone, X-rays are the best. MRIs pick up soft tissue, X-rays pick up bone. If you think there is ligament or muscle damage, get an MRI. If you think it is broken, go with the X-rays. I will agree with picked off though in that just because X-rays were negative, doesn't necessarily mean it isn't broken. Could be broken in a tough angle for the X-ray to see. Or maybe the doctor just didn't look close enough. If you have doubts, get a second opinion. Let the new doctor look at the X-rays already taken. Maybe he will pick up something the other doctor didn't see, or maybe he'll want to take them from a different angle.
Either way, if it still hurts, back off. Not worth risking college ball in the fall. Good luck.