ADHD+School+Work+Marriage=Frustration

My wife and I have been married for 2 years. Last year, I was diagnosed with ADHD and am now being treated with Adderall. At first I felt dramatically better, more focuses and able to do the things I needed to do. This new found ability to focus led me to do something I had wanted to do since I had graduated high school: Get a degree. I am now a month into school, which I am doing online. I have to work full time and then I return home to go to school full time. I find myself so focused on completing all my work that I neglect my wife. This has led me to feel very guilty and angry with myself. My problem is, in order to provide for my wife and future family, I need the degree so I can't quit or cut down on school. But this anger and inpatients with myself has led to me throwing temper tantrums, and nit picking small things my wife does that frustrate me. I am blessed with a very wonderful and patient wife, but my own guilt at not being able to give her the emotinal attention she deserves and my constantly raging anger have led me to think it is in her best interest if she were married to someone else. I know that the facts don't point that way, but I can't seem to find anything that will either rectify the situation (i.e. keeping myself calm) or to make me realize that my wife is willing to be patient while I get my degree so that we can live comfortably later. If anyone has any advice or experience with similar situations I would be ever grateful.