There is a book called "Constructive Living" by David K Reynolds. It posits that you don't have to feel like doing something in before you do it. The only thing required is action. An example; the sink is full of dishes, but you're exhausted from a full day of work and don't "feel" like doing the dishes. The feeling doesn't matter. Constructive Living says you do the dishes regardless. After your done with the dishes you will experience the positive feelings you were waiting for. It boils down to doing in order to feel.

I hope that makes sense. The book is based off of Japanese Morita Therapy.