Chronic Leg Pain

I am 45 year's old and weigh 180 lbs. I have been having severe pain in both legs. It is so bad it feels as if i've just underwent major surgery. When lying down its bad, then when I stand up and try to walk I am in pain even while walking. I am going to the doctors' but has anyone else experienced this? August of last year I had a full hystorectomy, and I am not taking any harmonial pills, I know that I need to take something but haven't as yet, I was thinking maybe that would be it, my body is not getting the progestren that it needs.