My best general advice:
Verbal/emotional abuse is a very good reason to separate and possibly divorce.
Take such actions under the guidance of your priest and a counselor, and after consulting with an attorney. If you cannot afford an attorney, talk to a domestic violence center or possibly the self-help section of your local courthouse.
Decide in advance the conditions under which you would consider reconcilliation with your husband. Do not go back just because he told you that he is sorry and has seen the light. If you have been married to an abuser for twenty years, you have no doubt heard this umpteen gazillion times, then when things settle down, the familiar pattern emerges. With the help of a counselor decide which concrete steps your husband must take to demonstrate that this time is different. Also, decide in advance the minimum amount of time that you will need in order to discern whether or not he is going to make the improvements needed. 12-18 months should give you a clear picture. During the first weeks and possibly up to the first 3 months, he will promise you that miracles have been happening to him. If you stand firm, you might find that those are some pretty short-lived miracles.
Something that people who have not been through this do not understand is what it has been like to be brutally hurt by someone that you have made yourself vulnerable to, repeatedly. Once you step away emotionally and can see, almost for the first time, what you have been through over the years, it can make you pretty sick. The thought of staying with the person who has done this to you, fills you with panic and dread.
Whatever you decide, make sure that you have friends and relatives who will be there for you, because you will need a lot of support to stay strong. I also can not stress enough the importance of counseling.
Prayers for you. This is tough but doable.
**And a caveat. If you separate, DO NOT date, become close friends with, or become in any way dependent on another man, single or married. You cannot make clear decisions with such entanglement, and such a relationship will inhibit your abilit to make the growth and changes that you will need to make.