Fell down stairs Monday, hit lower left arm on wooden edge of step. Thought it was broken, after a& e four hours, told wasn t broken, went home in a lot of pain. Now a week later I can t sleep as I am getting cramp in muscle of the arm all night, so painful. Dent in skin and painful swelling below this. very painful all day but cramps all night. How can I stop these please? Neurophen doesn t help.