Is this ocd or is something wrong?

've had an ultrasound, physical exams, blood work and d dimer test to Rule o dvt in. The last few months. Every little pain or twinge in my leg I think the worst. I woke up with a painful calf and am freaking out. Everytime I go to the drs and they tell me everything's fine I feel so happy and the pain goes away. What should I do? I'm freaked about rhis pain