Seriously, take a break. I had the exact problem. It was tendenitis, and for that I strongly recommend RICE (Rest, Ice, Compression, Elevation). Believe me, it may suck to take time off until it feels better, but it will be well worth it. Push beyond the pain, and you will prolong the healing time. When I took off time, about 2-3 weeks did it for me. Tendons are bitches to heal. In the meantime, just train legs and abs.