Pain in right leg muscles. Pain more.

Nov 6,15 i met wth an acdnt in wch my right knee get injure,Accrdg to my rpt, my acl has teared, pcl buck n lcl has partially teared, at first it was painfull to walk, after taking physio it became quite relax to me but further it was very painfull to me to stand while10-15 min contineously,my right knee muscles (back of knee) pain so much, after sitting for a break it was ok. then i conslt to the doctor he advise me to continue wth ur exercise but it was not possible to do exercise bcoz it pains the muscles, As the time is going the pain grew n now a day the back muscles of right leg from waist to toe, the pain remains contineously, even it doesn't relax after taking rest. The back muscles paining so much it can't be possible for me to withstand with this pain. Some suggest me to go for surgery but i totally scared what could i do it cost more for me or the risks after surgery. So pls suggest me the right one surgery or tharapy what is good for me i couldn't live with this pain more.