Most relationships have a "honeymoon" phase that is not sustainable over the long haul. The time comes when hard stresses, like things being difficult at work, come along. Being "consumed with anger at his bosses" sounds like a man who is emotionally immature. This is something he may, or may not, grow out of.

I'm not so sure a person becomes mentally ill because their marriage is not going well. More likely, as I understand it, an unhappy marriage may cause underlying mental illness to become more apparent. In any case you have a big decision to grapple with - whether to stay or go. You have to look at what you have to gain or lose by staying verses what you have to gain or lose by leaving. Part of that depends on the capacity of both your husband and yourself to grow and mature.