I couldn’t tell you how many times I’ve heard, “You need to make a habit of writing everyday

Expert advice, and it’s correct. But here I am just now considering working on the third novel after not writing anything except these short-forms for two months.
So yes, I feel guilty for not writing. I was doing so well at writing every day. I was up to almost a whole month of daily writing.
But sometimes, you just can’t.
When you’re struggling mentally, it’s time to take a break.