Open Question: Can stress and unhappiness cause diabetes?

I am in good condition and has the most of my life. (6-foot-one hundred and eighty pounds) I am very active, playing basketball, etc. to run. But I must admit that my attitude in the past decade has been bad, I have more pressure and joy, only resentment. Last year, I discovered, laid-off I found that I had type 2 diabetes and its really bugging me, and I so much exercise, eating healthy, there is still this sick. I am slowly learning the pressure, not to worry, and have a better attitude. I really think that their emotions may be a lot related to this, who can confirm this?