What should I do if my entire window crashes after trying to undo a mistake in the Notes app?

so i write chapters on my notes app on my iPhone then i sign on to my windows computer and i take those chapter out to edit for my comic. problem is when i was preparing the next chapter i selected the entire thing and type c instead of ctrl c. when i tried to crtl z the entire window crashed, leaving me with a c where the chapter was, i checked on my phone to and the c is still there, is there anyway to get back what i lost? (I have 3 weeks)