My sitter cancelled last minute. Can anyone help?

I’d just say you have plenty of time so try not to worry too much, although it is very upsetting to have a cancellation.
I strongly suggest that you link your listing (and profile) here.
Also, if you use key words (such as ‘sitter cancelled) in the spy glass in the top right hand corner to search you’ll find plenty of suggestions to help you. Here’s one of many:

And this will help you link your listing on the forum