Severe Pain in Hip

My pains began 9 years ago after the birth of my daughter.
Then they were eased by otc pain killers and a hot bath. After a while, they went away almost completely, only reoccuring after a lot of activity.
When I got pregnant with my second child five years later, things got a lot worse.
I couldn’t roll over in bed.
Walking was almost impossible some days. After his birth, the pain eased but was always present. Now, three years later, I have a new baby. And the pains are at their very worse and seem to be increasing. About two weeks ago, the pains began in my right hip and have been constant ever since.
I didn’t fall or do anything to injure the area.
The pains are typically severe and sometimes down in to my knee.
I walk with a limp.
I have swelling of the entire leg and numbness in several areas between my hip and knee.
What could be causing these pains?
I know I need a doctor, but I don’t have insurance, and honestly no extra money for the visit. Does anyone have any ideas or suggestions?
I would appreciate a response from a doctor! Thank you!