Diabetes and Candida are linked; the reason for this happens is below.
People who contract a Candida infestation generally have two main symptoms which pre-disposed them to Candida albicans. The main factor is called neutropenia; this is simply a decrease in the number of white blood cells in the blood which means that the immune system is not fully functioning. This results in the increased susceptibility to various infections which include fungal infections. The other factor is diabetes mellitus; this is caused by the excessive intake of carbohydrates such as sugars and starches in our diet causing high blood sugars, and high blood sugar supports the growth of Candida in body tissues.
All of this is to say you we really have no way of knowing if you have a Candida infestation and diabetes, or simply the Candida infestation. A doctor should be able to tell through tests however.
If you do have diabetes, it can be controlled with the Candida diet.