Ive been told that there is only one doctor who will operate on the occipital bone. bump on my head that is in the center bottom of occipital bone?

Not sure: surgery to the occipital bone (for any reason) is usually done by either a neurosurgeon or perhaps a maxillo facial surgeon. Need evaluation and imaging first to diagnose what the bump is and whether surgery for it is appropriate.

Why needed? : Do you gave a terribly deformed occipital bone? If it's simply a minor cosmetic problem, then best to leave well enough alone. You say "there is only one doctor who will operate": is your problem so rare there is a lack of experienced doctors; or is it because experienced doctors disapprove? I suspect they disapprove. Unless you have a serious deformity, I think you should too. Hope that helps.