If you're in a funk, the best thing to do is admit it and then forget it. Inspiration comes when you least expect it and then sometimes you get onto a roll!
My advice would be: don't lose any sleep over it.
If it doesn't ever come then so what? You've lost interest, there's no need to force yourself. Chances are, in letting it go for a while you'll be bursting with ideas!
Another piece of advice would be to go on a holiday or do something that changes your mindset and routine.
Either way, it sounds like some time to "not think" while actually figuring out heaps and therefore thinking heaps.
Good luck!