Emily, sorry to hear that you have experienced something similar to what happened to my kitten.
My husband and I adopted a new kitten soon after this incident happened. We had so many worries - would I feel guilty getting a new one, would we be able to love it as much, would our dog adapt to a new kitten...and of course, what if I hurt this one too?
We've now had our new kitten for 7 weeks and she has helped us so much. We still miss our first kitten & could never replace her, but spending time with our new one was the first thing to help us start to heal. My new one is such a different little personality & I have grown to love her just as much, although I still miss my little grey cat. I had awful flashbacks for a while and had to remove my plug in air freshener from the room she died in as the smell brought me right back to that moment! I still sometimes get feelings of guilt but I've come to realise accidents happen & I can't punish myself forever.
I hope you can find peace too!