What Causes Pain In The Hip Joint?

Today, my hip joint began to hurt when I walked. It has continued to worsen even though I took Tylenol. It became so painful that I’m resting with heat on it as I write you. Two weeks ago, I had a dramatic fall on the driveway, but the only injury was a scraped knee. Nothing else hurt. It seems odd that an accident two weeks ago would suddenly begin causing so much pain. I don’t recall having an accident in the past 48 hours. I haven’t done any heavy lifting, or strenuous housework. Just the normal everyday routines. I have been diagnosed with osteoarthritis, but mostly in my hands , ankles and feet. I take diclofenac.