Very sorry to hear about your brother. My sympathies to all who loved and will miss him.
I've changed careers a few times. The last was when I was 42.
I have friends who went to college for substance abuse counseling. Only one is still in it. I understand, from them and some that work in my current town, that it can be a very frustrating profession. Kudos to those who can do it without burning out.
My only caveat would be that it is a very narrow degree. Not marketable to diverse positions. But, you would be in a better position having the Equine Health degree also.