I dont know about the shoulder, but all the pain else where and while breathing sounds to me like muscle spasms. Occasionally I get them in my back and if they are bad it hurts like crazy when I breathe... but they tend to go away after a few days. I dont know if its the same, but kinda sounds like it. If it keeps up I say go see the doctor, possibly a different one if yours is as dumb as you say he is.