Frozen shoulder. Correct information.

I am suffering from rotator cuff problem. I took treatment for this but still I can't lift my right hand straight up and can't keep my hand back conveniently. Since from 8 months I have this problem . In the month of April one doctor given injection at the back of shoulder but I still suffered pain after three months i.e in the month of July I consulted another doctor he also given injection at back side and front of shoulder and advised to go for physiotherapy. I took physiotherapy treatment for 14 days and after that I started doing excercise at home , now I can lift my hand up but not straight. Still I feel pain in that area . Please help me in this matter. I nearly consulted 4 doctors in this matter all are not giving correct information.