Should I continue on with school?

So I am looking for any advice I can get from all related sources. I am an LPN, in michigan, went to a community college intending on getting my RN. I repeated several classes, due to ADD, reading comprehension issues, lack of support from my husband, having 3 children, and working. I graduated with my LPN in December of 2006. I exited out of the ladder program to take chemistry, and work.(for experience, and money.) I took chemistry, and had to repeat it b/c I did not get a 77. So a year later I took it again and passed. I have been working continuesly since I got my LPN. I have a job in a hospital as a LPN. My passion is OB, that is why I went to school. I work in the Family Birthing Unit but float to the other departments when the census is down. I have a great personality and love people. I am complimented frequently for my personality. The problem I have is test taking, and retaining the infromation. I have taken classes, and bought visual flashcards, studied my butt off, and then I get grades like 78, 68, 77. I went back into the community college nursing program in fall 2010, for the 1st semester of my 2nd year. I was taking cardiology, icu, er, etc. I did horrible. My husband is working out of state, leaving me with all of the responsibilty, but I studied hard. I finished the class with a 70%. Needing a 77%. So I am now kicked out of the program, because I have repaeated more than 2 classes, in the nursing program. I am devastated. I really want to be a nurse. I am 40 years old, and have been working on this for 8 years. All of the programs around me, will require me to repeat my A&P classes, b/c they r 7 years old. I just don't know what to do. I wonder if I should try Excelsior, since I just learned all of the cardio and intensive stuff and I work In a hospital where I can get clinical experience. Please any advice I will take, good or bad. Thanks.

I forgot to mention, I started taking Adderal 25mg, this fall for the ADD, and seeing a psychologist for counseling, and it does help me to focus. Maybe just did not take it soon enough?