He is like jekyl and hyde with mood swings. he is very quiet, unless angered, and he trusts no one. I almost can't handle it anymore. He says there is nothing wrong with him and he does not need any damn pills to make it through life.
That's a difficult position to be in. I would suggest that instead of pointing out to him that "he" has a problem, suggest that there is a problem between you both, and that you think you should try marriage counseling. It's at those sessions that you will both open up and he'll see he has some issues, at least this way he doesn't feel so offended and you're by his side and you can learn to react to him in a way to help him change or realize his behavior before acting on it.