Pain in muscle. Any suggestions please?

Hello, I've met an accident on May 4th 2017, my Scooty Slipped awfully, I fall on right side of arm, I got hurt on knees, arms, foot. I went home, cleaned it with detol and clean water, then I went to doctor he applied betadine which was painful because my skin was peeled, he has given me tetanus, after 4-5 days he has given me an injection for reducing pain, from that day when I got that pain killer injection on my arms my arms started paining like hell and it was numb on that area, i asked doctor he said it will become normal just keep on warming it and rub balms, i did, pain reduced, but till now i have that pain and that numbness, it reduced but when i touch it lightly too it pains, and its too much. I don't know what's happening? any suggestions please?