Any family practitioner or GP will do in this regard. You do not need an endocrinologist. Whether you will be able to tell them about your AAS use is an entirely different matter. A few are knowledgeable, but by and large medical school has indoctrinated most docs into putting AAS into the same class as recreational drugs. Even if they won't prescribe anything, most will still order the necessary tests, particularly if you are a cash-paying patient. (They don't want the hassle of arguing necessity with the insurance company).