That's fine, that's what we're here for! We all understand so this is the perfect place for it! away as much as you like
I really relate with everything you said there.
I too have struggled with the thought of 'why can't I cope with it when I know it's an illness'. It was compounded by comments my ex would make like 'you wouldn't break up with someone because they had cancer' and the like. There are two ways that I try to look at this now, one is that yes it's an illness but other illnesses don't make the ill person be verbally, emotionally and sometimes physically abusive to you, so that's a HUGE discrepancy when comparing. The other is that maybe this is just another way of being incompatible as partners, just like other people in normal rs's find they are incompatible for various reasons, I'm incompatible with my ex because I can't cope with his rages. I don't think many people could cope with it, so don't knock yourself for having the balls to admit it.
I've also at times felt like I wanted to let rip at him, throw back some of the really hurtful things he's said, make him feel like he's made me feel etc. The thing that really helped me with this was going to Al-anon. I know you'll understand this as you've said about being in AA. Al-anon helped me see that the only thing I can control is myself and my behaviour and having that kind of reaction was only going to compound things as well as not being a very nice way to act (which would leave me feeling horrible if I'd done it, rather than reeling relief for letting it out). Having said that, I know that sometimes the emotions boil up so quickly you almost don't have time to reason with yourself and your first thought is to let it all out.
And seeing him able to be nice as pie to a lot of people (there are many people who think he's a fantastic guy, because the side they see of him is! It's a side that I used to get presented to me, but I've seen that very little recent years), and then be nasty and the complete opposite to me was really difficult to take. It was definitely one of the many parts that added up into me breaking up with him.
I know it all feels too much at times, even after the break up, but It will gets easier. You've been very strong already, that strength will see you through to the other side!