I HAVE BEEN HAVING SEVERE PAIN ON SIDE AND ON

I HAVE BEEN HAVING SEVERE PAIN ON SIDE AND ON TOP OF MY RIGHT FOOT AND SEVERE SWELLING OF MY ANKLE . VERY VERY PAINFUL TO THE POINT THAT I CAN'T BARELY TOLERATE IT ANYMORE. I STAND ALL DAY AT WORK FOR 9 HRS AND THEN ANOTHER 3 AT HOME . MY DR TOOK ME OFF MOBIC HE THOUGHT IT WAS CAUSING IT BUT IT IS ONLY GETTING WORSE AND NOW TO THE POINT I'M FALLING AT TIMES ! pLEASE CAN YOU GIVE ME ANY IDEAL OF WHAT THIS HORRIABLE PAIN IS . BECAUSE I'M NOT ABLE TO PUT MY FEET ON THE FLOOR WHEN I GET UP EVERY MORNING IT HURTS SO BAD !