Welcome to healthcare magic.After you fell down, if you happen to see swelling by that area or redness
and pain of course, about which you mentioned, i would suggest get an X-ray done. The X-ray is just to confirm, the joints/ bones are intact.Probably, it could be soft tissue injury
or about the ligament which takes some time to get healed. Meanwhile start on pain killers along with a PPIs like pantoprazole
1 tab a day. You may also take a muscle relaxant
. But better get yourself checked by an orthopedician.