That's an incredibly open and honest post, thanks for posting it. I think most of us can relate to it.

For me, one of the things that helped me overcome similar feelings was scheduling my day so fully that I was/am constantly focused on something (whether it's reading, working, resting, etc.) - I always have a plan for what I'd like to be doing. Sort of my version of intentional living. I have used several online tools to help me with this, starting with Evernote, Clear and now I am hooked on simplist.me.

Taking the focus off of yourself on ON getting something done not only takes away a lot of the time you have to overthink, you also end up getting a lot more done that you want to get done, which makes you feel good about yourself!