Did the urgent care do an x ray of it? Obviously something is going on. I would go to your regular general practitioner, an orthopedic doctor or the ER for determination of what is happening. Clearly something is. Odd that the urgent care just sent you home with a food that swollen that you have pain and can't walk on. I would, in the mean time, take ibuprofen for reduction in swelling and pain relief, put some ice on it and elevate it. But go to a regular doctor (not back to that urgent care) and find out the root cause causing this situation. good luck