Investigate writing
I notice you write to the point. Given a clear message, you put it across clearly. This is not an everyday gift.
You could write about IT subjects. You have some history and expertise there. You probably also have stories to tell, from your own life. Writing them out may help you develop the gift of seeing other stories that are lying around, waiting for an author's voice.
You may be able to do consulting, even as little as delivering, say, Excel-based VB applications to small businesses. It demands dealing with people, assessing requirements, understanding the picture, and fitting a tool to the task. Quickness of apprehension is not the same as excellence of understanding, and you may well find that your apparent mental issues are not obstacles to the important uses of your brain. Most of the programming could be done at a home office, a help to you. It would give you something else to write about, incidentally.
Also, don't neglect the medical and physical aspects of your case. Assuming everything is linked to the diabetes, which is reasonable, you should fight it. Get rid of any grey fat piled up on your internal organs (which is suspected to be an evil agent in type 2 diabetes.) Lose weight, avoid all sugar and most simple starches, and become physically fit. These steps will help address depression as well. Become an expert in your diseases, so you can judge what your physician is telling you. Physicians are not gods; they have lots of personal shortcomings that may influence the way they work and the advice they give you. Good doctors and bad doctors are like good an bad auto mechanics; the only way you can tell if you're getting good mechanical advice is to understand your car. So, understand yourself, and get a fresh doc, or ignore some of what he says, when he's talking crap.
Good luck to you. Men in my family have been cut back by diabetes; it's a pig of a disease. Take as much control as you can.
