Hi Michelle and welcome to SR.
I'm sorry to hear the sadness in your words for the marriage you wish you had with your husband. That whole potential thing is a killer, isn't it?
Check out the sticky posts at the top of the forum as there is loads of information in there to keep you busy for a few days. Then maybe check out the al-anon meeting - the anon bit means that what goes on in the rooms stays in the rooms. As for ruining his practice if the information gets out, it is likely that he'll do that all by himself if his drinking and raging continue. Is there any concern about his ability to practice? Because that could open him (and you) up to a whole world of financial pain, not to mention any harm that may come to his patients.
BTW, does he rage at his patients and their parents? If not, then he is perfectly able to control his outbursts and you do not need to be a witness or focus of them.
Hope you settle in and read and post lots. If you see any recovery topic that you want to explore, start a thread on it because there is a wealth of information among the members here.