Step 4: Read and complete the decision guide to learn more about your symptoms.
Okay, just to review: your ankle pain is not mild, there's no associated fever, it's been going on for at least three weeks with swelling and no other joints are painful.
Just one more question:
Is your ankle pain worse in the morning for at least 30 minutes? Another way to ask this is: Does it take at least 30 minutes for your ankle to get as good as it's going to get for the rest of the day?