I've found the Mindfulness-Based Stress Reduction approach developed by Jon Kabat Zinn most helpful for my practice. Here is a link to an article in Psychology Today that explains the approach: https://www.psychologytoday.com/us/blog/crisis-knocks/201003/mindfulness-based-stress-reduction-what-it-is-how-it-helps. There is a book available on Amazon that would help you get started: "A Mindfulness Stress Reduction Workbook" by Stahl and Goldstein. When I first got started with mindfulness meditation in 2017 I found, via Goggle search, that there was a workshop offered in my community. It changed everything in my caregiving, all for the better. So you might check that out.
It is also important to realize that every time your husband shows a new sign that you are also dealing with loss. An excellent resource to help process this is "Ambiguous Loss, Learning to Live with Unresolved Grief by Pauline Boss.