Type II diabetes is what is called an AME Assisted Special Issuance (AASI). That means the FAA will need to review your initial application, after which you should get an authorization to receive subsequent issuances directly from your AME (though usually on an annual basis rather than the 2 or 5 year cycle if you have a Class III). You will need routine lab work and a note from your treating doctor. A well-controlled type II case is not in any way a show-stopper, but I'm not going to pretend that dealing with the FAA on special issuance cases is ever stress-free. If you are "pre-diabetic" (on meds for slightly elevated blood sugar) or diet-controlled for several years, the process is much, much easier and generally goes no farther than your AME. Type I is even certifiable, but subject to a lot more requirements.

Feel free to give us a call if we can help in any way. I can get you in touch with a volunteer AME if you or your doctor have technical questions.