I don't have those self-doubts as much as I used to because I've been through this a few times now. That feeling of thinking I should be writing...but I don't want to. I have ideas but none of them excite me. I have a few projects I've started that I could go back to. I did go back to them. They didn't excite me either.
This usually happens when I've been writing like crazy and yes, I've just completed a few manuscripts and I guess somehow my brain just needs to rest and regenerate or something. I wanted to write something fast and easy, something that doesn't take a lot of research or planning, something hot and sexy and fun. Even that seemed beyond me, though I'd started something that I thought fit the bill.
This morning I woke up early (except for the Daylight Savings Time thing - losing an hour REALLY annoys me, but maybe it wasn't so bad because I wasn't writing something and didn't feel that urgent need to GET UP OUT OF BED AND GET WORKING which I usually feel) so I lay in bed for a while and started thinking about the story I'd started and a few hot scenes came to mind and...whoa! I was inspired!
And I wrote nearly 4000 words today on that story. Yay!