As a professional artist, I completely understand what you're talking about.
Everyone gets creative blocks from time to time.
Everyone.
Period.
The important thing to remember is to
Relax. It WILL pass, and when it does, you'll be more refined for it.
I usually try to distract myself with those passing interests that I always ment to do, but had something else to do first.
I've found that anytime I try to overthink a project, it becomes filled with ruts and blocks, causing me to lose interest fast. But then, that works a little to my advantage, because it's almost second nature to become distracted for a bit, only to come back to it refreshed and ready to go.
Just relax. It's not the end, just a short pause while your brain resets.
I, Mudd.