Hi Jojo!
I'd like to join ambivalent mom in saying

That's good advice, I feel, about taking care of yourself. You have a lot to process and to do at the moment.
Are you still together? To what degree are you involved in each other's lives? In what way are you "supporting" him? May I ask what age your children are? Are they in school?
This is definitely a time to pull in the troops in terms of giving you a hand with the different practical things that you need help with! Who are the people you can call on?
Be mindful that you don't exhaust yourself. Your husband's diagnosis is a very good thing and the start of another journey, for which you will need your strength - especially if you are living together and/or co-parenting.
Taking a couple of hours a week to do something good just for yourself is a wonderful way to protect and nourish your sanity. This can be therapy, if you feel you would benefit from it, or a swim/sauna, regular meeting with friends, a massage, a wander around some shops, a walk in nature - whatever gives you some peace and yourself back to yourself.
There are excellent resources here too. Tell us more, Jojo, we are here for you.