Numbiness and cold sensation in left foot, along with calf cramps.?

I had my left ACL repaired a year ago. I had many complications (DVT, PE). Never really followed through with my PT, but I have lost 40 lbs and going to the gym now. THe last 2-3 weeks my left calf cramps and i get a numb/cold feeling in my foot. I went to the ER 3 days ago and I still am clot free (7 months now). I have no idea what is causing this, any ideas?