Hi
so sorry to hear what is happening with your husband. Illness and medications etc can have some very unexpected effects on mental health.

Have you tried to get help from other family members to help him see he may not be making the right decisions based on his health? Perhaps they can help you convince him to see his doctor about this behavior?Maybe your husband will agree to get evaluations and possible help, and things may get better.

If he refuses, and insists he wants out of the marriage, all you really can do is to look out for yourself. If he is going to be insensitive and make your life miserable, you may be better off on your own. Hard to do after many years of marriage, but sometimes necessary if there is no other way to live at least peacefully together.

I hope you have someone close who can support you emotionally through all this.