I am wondering if I could have some form of Thrombosis. I take birth control pills. Lately I have been experiencing a generalized intense "ache" in one leg in particular--sometimes both- when I run. The intensity of the pain generally subsides within 20 minutes or so after I stop running. But often a dull ache remains for days. The pain seems to start in my calf and travel up my thigh. I also have had a toenail on the same foot that turns purple whenever I'm cold. Could this be Thrombosis? I'm sort of nervous, but wondering if I'm just being paranoid..Should I see a doc? If so, what kind? Any advice would be appreciated!