So good to hear from you. Glad to see that your dad test came back good and it's good they are trying to find out what is wrong with your dad.
Regarding your H I don't know what to say. I know it's very hard. My heart goes to you. I don't have anything to say apart that I'm glad that you are back and I missed you.
Keep being strong for your kids. It does get easier as each day goes back. I still love my STBXH, unfortunately I don't see any improvement in my situation. Could you limit his access to the house like I did with mine?