Is dvt pain constant or does it come and go? is it sharp? what kind of pain is it?

Usually little pain: Still worred about your factor V Leiden, right? DVT never causes pain as the only symptom. The main symptom is swelling of one leg, which becomes substantially larger than the other, especially in the calf. It may be painful or tender, but not necessarily. Pain w/o swelling is rarely a DVT. Anyway, you are unlikely to ever have a DVT unless you have other predisposing factors; see other replies.