go to Dr. or ER and get it checked out immediately
my mom age 76, just last week fell in the garage and didn't tell anyone, it swelled up immediately and in severe pain, 2 hours later was in lots of pain and couldn't walk, she finally decided to tell her hubby (who is blind) and he made her go to ER so a friend took her
She had sprained her foot and ankle bad, ER doctor gave her meds, and told her to go home, take meds, elevate foot and ice it for 20 minutes at a time and to stay off of it
I hope you are feeling better, please go to Dr. to get it checked out!