In the mean time, ice, heat, and an anti-inflammatory medication (Advil, Aleve) can help it feel better immediately. I had the same problem and no one could figure out what was causing it. I happened to have become unemployed around that time so I spent 2 full days icing and heating the area. I felt like a complete slug and hated sitting in front of the boob tube for such an extended period of time. I also felt like I was being a baby for pampering myself like that. But it worked and I've never had the problem again. I just did ice for 15 minutes, heat for 15 minutes, and then nothing for 15 minutes over and over. So I guess being a pampered slug did have it's payoff for me!