Hon... I would get another dr. if possible. Not sure how mobile you are or if your leg is red and warm... but there is the potential for DVT (deep vein thrombosis) this causes swelling, redness, warmth and pain. Whatever the reason you need this looked at and taken seriously. It could very easily be a matter of the fact that you might be sitting a lot and putting pressure on certain veins an arteries... but regardless you want a definitive answer.
A dr. can feel guilty (my dr did at first) He didn't want to tell me I had cancer (he is an amazing dr. and has known me for years) He said I don't like giving news like this - I told him I would much rather hear it from him... someone I know and trust than a specialist who doesn't know me from Adam (plus the specialist he sent me to was an IDIOT) He was also fantastic moving me along to different scans and finally to the specialist of my choice. I really do love the man. If you do not feel confident and happy with who is treating you - get out NOW. This can only be a bad thing. hugs