Oh you poor thing.
My dd had CP a few weeks ago and I'm pregnant, I found it really hard. Having a tiny baby must be exhausting, we send big hugs.
We used a mix of calpol, calprophen, boots own version of piriton and Aveeno cream. We used the aloe vera gel from Holland and barret after to help heal the spots.
I put heaps of bubbles in the bath and got in myself to convince dd to get it. She did eventually and then I was giving her up to 6 baths a day to stop the itching.
My dd also got spots in her mouth and nose so she stopped eating and drinking. The only thing she would take was ice cream or chocolate milk.
After the spots have scabbed then I recommend putting lavender oil in the bath. It has amazing healing properties and helps the scabs heal without scarring. I couldn't use it because I'm pregnant and it's been known to bring on labour. But in your case it would help the scabs and hopefully send your kids off to sleep.
Good Luck