Re: staph in belly button
I know you say you have had this for 3 months but is that when you went to the doctor and started the antibiotics? If so then I would def. go get another opinion. I can't imagine a doctor saying not to call again if this has been going on for 3 months! Actually can't imagine him saying it at all. Are you sure this came from him and not the receptionist? Maybe you can call and ask that the doctor call you back him/herself.
Maybe give a little more info here so others can help you more.
Do you have a fever? How long have you been on the antibiotics? When did you last see the doctor?