Next Steps?

About a month ago, I was on my regular five mile run and felt soreness in my right thigh. As someone who has been working to lose weight, I am used to aches and pains and ran through it for two days. On the third day, I was feeling the pain more intensely and walked one of the hills on my run. When I tried to run at the top of the hill, I was unable to do so becuase of the pain. For two weeks, I was unable to run and my walking was affected as well. I have pain in a specific area of my thigh that seems deeper than muscle... I am able to stretch the leg without pain, but "see stars" whenever I try to run. After two weeks, I went to my general practice doctor who told me to give it another two weeks without running. I have continued walking daily, but still feel intense pain if I try to run even after a month. The pain continues in my thigh and I also feel it in my hip and on the outside of my knee if I push to hard. My general doctor felt as though it was a muscle issue, but I am not sure. Should I seek a second opinion?