Keep your chin up! Believe me, you have nothing to apologize for. You were optimistic about how long it might take to make some seemingly minor adjustments to the game, but it's not like you were being deceptive--the key word is optimistic. You made a big change by quitting your dayjob (which I fully support, that work schedule sounded atrocious), and that gave you a good feeling about your ability to focus on the game and make things happen. You took charge of your life, which gave you an optimistic outlook, and that's a good thing.
I'm sure it was really unexpected and discouraging when you realized that you have to basically recode the AI from scratch, and I know how easy it is to focus on the negatives when a brick wall like that happens--negatives like not meeting deadlines you'd proposed, and lunatics on the internet saying awful things. By all means, take a little break and remind yourself of the positives in your life: your friends, your fans, stuff like that.
Sorry for slipping into Preachy Life Coach Mode. The key takeaway is: you've done great, and you're still doing great. You wrapped up Part 1.1.1 very quickly when you went full-time on it, and it looks to me like you're making excellent progress on making the AI more readily modifiable. Don't let yourself get overwhelmed if more coding issues come up--just remember that's the nature of the beast.
Hang in there! Stay optimistic!