Two Months Ago, My Right Hamstring Locked Up And I

Two months ago, my right hamstring locked up and I couldn't move my right leg or walk without holding on to something. I had been to San Francisco and walked quite a bit. My left hamstring, pelvis, and hip were injured several years ago due to a work-related golf cart accident, so they thing I favored the leg on my trip and caused a delayed muscle spasm. A blood clot was ruled out. I've done medical massage, which has helped, but the pain in my upper quads and tops of my knees continues. I really afford to keep massage, and want this to stop. Do I need to go back to the Dr.?