I replaced my shower head two weeks ago ( hand held) with the same unit. The bracket broke on the old one and instead of just replacing the bracket I decided to replace the entire head. All was well until today. Now there is water leaking from the wall, behind the supply pipe. What happened? Can I fix this myself without calling a plumber?

Before we can help we need to know exactly what's leaking in the wall. By "supply pipe' are you referring to the shower raiser? Did you replace or undo the chrome shower arm that connects inside the wall to a drop eared ell? Regards, Tom