Me, my friend have a similar problem.
Kinda "syndrome of perfection".
For me, I have a plan about my project and life. What i'm doing now, tomorrow, and for the future.
I need to keep rethinking about my plan again.. and again.. and again.. Because, if I not thinking about it, I feel I just missing "something".
And it feel really uncomfortable. For that, I need to re-thinking it again.
And it will make me feel a little bit better.
But after 5-10 minutes the "uncomfortable" missing feeling will pop-up again. And .. repeat the process.
Till I meditate and be "nothing". It will gone. <-- The hardest part.