Whats the best solution for me as a diabetic with ADHD?

I've been diagnosed with sleep apnea, diabetes and now my girlfriend thinks i have ADHD. I haven't been able to hold down a job for a while...I always suffered from restlessness, being tired all the time and just plain fatigued. I've had sleep studies, operations to correct my sleep problems, been put on diets and pills to help me live a normal life but none of this stuff has helped me much. When doing any thing my mind wanders constantly. I can never focus very well or have clarity and tend to procrastinate all the time. Exercise seems to help a little but doesnt solve my problems. I can never concetrate on 1 thing for to long and tend to jump from one thing to another, rarely finishing anything i start. Most of the time when things require any mental effort on my part i get frustrated very easily by it. I've never been diagnosed with ADHD but i'm sure i have it. Someone i met at a quilt shop my girlfriend shops at suggested i try and get on disability for my ADHD. Is this possible?