Logic and Optimism

I've always run off one rule that for the most part, keeps me happy. If the number of good things that happen in a day outnumber those that are bad, then I've had a good day. For the most part, this means I have good days. And if I don't, there's always a good one out there. But why is it that even after having days that, according to this rule, were absolutely amazing, I'm just uncomfortable?

I've woken up just in a haze, not wanting to get out of bed. I've been ridiculously unproductive. And despite having tons of fun rock climbing, silly stringing my RCA, and cooking food with people, I just have this tenseness that won't go away. I feel off all the time. I've lived my whole life according to this policy, optimism. And I believe what I tell myself, I truly do, but it doesn't seem to help. It's like what I believe doesn't affect how I feel, and it's the most frustrating thing ever.