New here, at a loss...

Hi, fairly new here.  I recently rediscovered this site in an attempt to figure out what is going on with my marriage.

My husband and I have been together for 9 years now, married for 6.  When we were dating he told me that he was diagnosed ADHD as a child, but I never thought anything of it. I was pretty young when we met (I 20, he 30), and never had any experience with ADHD other than knowing that kids were sometimes prescribed Ritalin for it.  Things were pretty good for quite a few years.  We hardly ever fought, I was the organizational person and loved planning trips, etc. and liked that he brought the spontaneous side out in me.  Shortly after we got married, things started to change slowly, then drastically when he decided to go back to school to change careers about a year into our marriage.  He would get so stressed out about school, to the point where he quit his job because he "couldn't" work while also going to school.  This stress would come out in the form of yelling, picking fights, and just generally being rude to me.  I couldn't understand why he was being like this especially since I was able to work full time and go to school full time while we were dating without blowing up in his face every day.  Things have just continued to get worse from there, and it's been almost 5 years since he started school now.  We have been through a lot in the last 5 years:  bankruptcy (my first, his 2nd from a previous marriage), living with family due to financial hardship (not great for even the best of marriages), unemployment, the start and dissolution of a business, pregnancy