Help with painful leg after hyperextension.

3 weeks ago I hyperextended my left knee.  It hurt immediately with a pop, but soon felt better.  3 days later I could barely walk and it hurt to do anything but lay on my right side in a fetal position.  A small amout of blood pooled in my ankle while the back of my knee became swollen.  I did a week of rest, ice and elevation and saw a tad bit of improvement. (All the while waiting for my Primary appt.)  Today I have a 4 inch knot in my calf muscle, about half way down the back of my leg.  It doesn't hurt, I tend to think it's fluid.  Still swelling behind my knee, now there are nerves involved as the outside of my ankle and foot are tingling. The main pain area is about 3 inches above and below the back of my knee. . . Finally get to see my Primary today ~ any thoughts on what may be going on in there?
Thanks for your time.
Kat

[katinchatt]

UPDATE ~ received X-today, but it's unlikely anything will show up.  I feel it's soft tissue damage.  At least she confirmed swelling, and the blood pooling in my ankle, though it's not as bad as the 1st week of injury.  Next will be an MRI after results are sent to her.  She gave me a script for Celebrex because I can't tolerate most NSAID's.  

Another question??  I have no back pain, could this possibly be sciatic nerve pain.  Today it's a 9 on the pain scale (due to the positions & probing my Primary had me get into).  I dislocated my knee cap once, and I don't remember it being this painful.  
Thanks for listening.

[katinchatt]

MRI Wednesday - still no clue as now it's "moving" all around my left.  First Knee, then calf and then ankle, now it's hamstring.  Hope it's not a clot heading up my leg now.  Maybe wish I had seen my Dr. earlier. . . .  fingers crossed