I have had problems with my husband for a long time. Do you think we will end up in divorce? I can't seem to make all his anger go away.

Im sure you are not insane. But yes a lot of energy is being expended on this issue.
So much of this energy out there these days. He is very angry and that is putting it mildly. But not at you but he does take it out on you. From where I stand I do not see divorce per say... but. Trouble is definitely in the brew. No affairs to speak of, he tend to get emotionally involved to a certain extent with other women, but that's not really an issue with his anger.
Parents, where not there for him, growing up like they should have been. One or both. Like he practically raised himself, technically speaking you should be having more problems with him than you are, due to what he has been through.
He feels like his mother should have protected him better and his dad been more of a man but not so. There is something going on around you to reminding him of this even more right now. A birthday, holiday, some significance at the same time every year. This will be a rough time for him and he will lash out every time.
They did not teach him how to deal with his emotions as they came up.. Like, when some one gets mad, you don't go out and get a gun or beat up some one. You learn self control and to sit with it until it passes and what to do with the energy that is more constructive. Talking it out etc.
All of his emotions are like this. He really means well, but the hurt is so tremendous, and he has pushed all his little boy emotions way down deep inside of him. Boys don't cry. Yes they do. And has never relased it in a healthy way. All those years of bottling it up inside has quadrupled the emotions he had to flat line all the time. He feels safe with you believe it or not to let out some of the steam, well a lot of the steam. But there is a lot more where that came from.
You cannot make it all right for him. I know you want to help. But just your being there with him by his side while he is undergoing this makes all the difference to him. Even though he doesn't always sing your praises he means to. But he literally hasn't been given that instruction either. This may sound strange but it is amazing how much we really do need certain instruction about how to grow up and take care of ourselves emotionally, not always physically. And it is amazing he made it this far with all the lack of he had going on.
Counseling, is the only way. Because he may get violent at times and you cannot protect yourself and you will take it personally and its stuff that needs to come out to someone not emotionally involved with him.
Counseling even if its only once a month( I know it can be pricey) will allow him to breathe more deeply again. His breadths(?) are so shallow because he is upset a lot of the time, could turn into heart problems later if not taken care of. Yes he suffers from a terrible broken heart, but not at your hands. And it wouldn't hurt fot you to go once in awhile. You also have some of this same energy going on in your background> peace ranieri