I have fibromyalgia(or multiple sclerosis, etc), is it safe for me to get implants?

This is up to you and your primary care physician, although I have friends who have both disorders and breast implants, nothing has gotten worse (or better) since the implantation of their prostheses many years ago.  The FDA released information stating that the IOM concluded that implants do not cause nor contribute to disorders such as these.

It must be said that those predisposed to have disorders may experience the onslaught of such after having been exposed to high levels of stress, trauma, surgery, foreign bodies, infections, high blood pressure, accidents, etc.