What Causes Severe Pain In The Leg With Swelling?

HI,

MY NAME IS TERESA, 49, WHITE FEMALE, ABOUT 250LBS. I HAVE HAD SEVERE PAIN IN MY LEFT LEG FOR THE PAT THREE WEEKS, AND ONE DAY I WOKE UP AND COULD NOT WALK, I HAD TO HAVE MY HUSBAND HELP ME SHOWER AND GET DRESSED. I HAVE A HISTORY OF DVT'S BUT DO NOT HAVE ANY AT THIS TIME, WENT TO THE HOSPITAL AND THEY RULED OUT DVT;S, BUT SAID I HAVE A SIATIC NERVE IN MY LEFT LEG, THE PAIN IS UNBEARABLE, I WAS GIVEN PAIN MEDS, ANDHAVE MY LEG PROPPED UP AT HOME, THE PAIN IS NOT GETTING BETTER, MY CALF AND ALL THE WAY UP THE BACK OF MY LEG IS IN TERRIBLE TERRIBLE PAIN. I DO NOT KNOW WHAT IS WRONG, PLEASE HELP, MY KNEE WAS SWOLLEN, BUT SWELLING IS GONE,THANK YOU