OP, so sorry to hear this, you can do this.
I am not a single parent but my husband works a lot and I did all nights / days etc.
When DS has chickenpox he was miserable and screamed when awake. I put a big duvet in front of the TV and spent the night with him there. I held him when screaming, let him feed on and off and watched rubbish TV.
Next day, I had his basket there and as soon as he was asleep, I put him in the basket and went to sleep. when he was awake, we watched rubbish TV (cuddling, clusterfeeding).
For me, giving up on achieving anything but sleep when available and cuddles for my baby took me through. I think I rewatched the first few seasons of greys anatomy in one go. …
obvously, use calamine lotion, painkiller (cannot remember if there was one of calpol /ibuprofen you weren’t allowed ?) etc, but once you cannot physically do more, your little baby will still need you to cuddle her and hold her. Horrid disease.
Not related to your current situation but my youngest is immunised against chickenpox. After what I went through with her big brother as a baby I thought no way.
sending you 🍫 🌺 ☕️