Sorry about your pain. It's well worth getting it checked by a doctor.
I had a similar pain for about 5 months over the summer.I was travelling so couldn't get it investigated. Finally got round to seeing the doctor and he told me it was my iliotibial (IT) band, a big tendon like thing that stretches from the hip to the outside of the knee. He gave me an exercise to do and told me to put ibuprofen gel on it at night. Within afew days my pain, which at times was so bad I could hardly walk, was cured.
You might have this or it could be something else. Get it checked by someone who is medically qualified and that way you won't damage yourself. I sincerely hope you won't suffer for as long as I did.
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