When Is Enough Enough?

I will try to keep this as brief as possible, as I think most of you who have become desperate enough to post personal information about your ADHD spouse on the internet can relate without excessive background information. And in no way do I intend that as an insult. I have come here because I have nowhere else and no one else to go. I am literally considering divorce. I am a very strong Christian woman, so this is almost embarrassing for me to type those words.

I have been with my husband for 9 years, married for 4. I AM MISERABLE. Unhappy. Sad. Depressed. Angry. Resentful. Fed up. Way past my limit, and way over my head in frustration. He knows he has ADHD, and has since 2nd grade. He is medicated, with Ritalin, and has tried everything else, so it's not like we don't know what works for him. He continues, to this day, to be a right-fighter, to lie about things that barely matter, and to over and under exaggerate to the point where I doubt he can even tell time anymore because that's how often he looks at a clock. There are numerous other things, most of which are typical ADHD things that drive me insane on a daily basis, including the fact that he doesn't work, has been fired at least twice that I know of in the last 2 years, and could care less about me and our daughter's financial, emotional, and spiritual security.

Should I even be considering divorce? What would you do? WHY DO I FEEL BAD ABOUT LEAVING THIS MAN!?