For The Last Three Days I Have Been Having Extreme

For the last three days I have been having extreme pain in my left leg. It is mainly in my upper thigh but does
hurt all the way down to my ankle. I have no bruises or swelling or anything you can see from the outside.
I have been soaking in warm baths which help but do not take the pain completely away. In the morning
when I wake it is not as bad but as the day goes on it is extremely hard to walk.