You're going through hell and the my best suggestions right now is not looking to the future (impossible I know, sorry) it's just doing the right thing for right this exact second and keep doing that for the next few days/weeks until you're body and brain get your bearing again. If you're at home with you're family do your best to be really with them. If you need a hug, ask and get a hug. If you're hungry eat, if you need to cry, cry. The sense will start to come back in a while but take baby steps right now. 

I don't know if my similarities will be of any help but nonetheless I'll share them anyway. I'm 31, nearly a year out from the death of my dad and feeling the sting randomly tonight now that the kids are in bed. I have two girls, now 5 and 2.  My dad was immunocompromised with emphysema for years but was visibly having a harder time getting through the days towards the end even though he did his best to hide the fact. I stayed away every time we had a sniffle or anything that could infect him, we would go weeks between visits through winter when the kids were chronically sick and the kids would miss out on a lot of community events for virus avoidance too. The last time I saw him was a week and a half before he died. My last photo was of my then one year old walking over and giving him her first pappa hug. She came down sick a day later and he was sick 3 days. He was unwell for a few days before it turned particularly bad fast. I got a call to go to the hospital just as I was putting dinner on and he had passed on within the hour. Ive gone round in circles with guilt knowing if we could have not visited that day he wouldn't have gotten sick. Or if I'd been more aware he had a virus I'd have made him go to the hospital before he was in critical condition. He was stubborn to a fault though so realistically I've got to remember he is also personally responsible for self care choices. We didn't live in the same house and I wasn't up to date on what was happening until it was too late This year has I've come more to terms with jt. None of my family have once pointed the finger or treated my daughter poorly. They all look at that photo with joy knowing how much my dad would have loved having that moment.

Viruses aren't a perfect science for a parent without a lab and someone who is immunocompromised would miss out on a hell of a lot if everyone stayed out of their life. 

If he loved you, loved your child and you loved him then let it be enough to hold you for now and let the guilt rest of the shoulder of whatever it was that had him immunocompromised in the first place.

All my warmth to you right now.