Positive Vibrations

My energy as of late has not been positive. I'm not exactly sure what's caused this shift from very high to kinda low, but I have to remember to keep a positive outlook on everything. It's easy to get caught up in the "He didn't do this," "she does this," "I can't believe this happened" thoughts that spin in my head.
When I was younger I used to read books of positive affirmations; just little sayings that are supposed to lift your spirits. Some days I would read pages of the books until I found one that fit, other days I would read the first page I opened to and keep that affirmation for the day. I haven't done this in years (although, I still do own these books), but i think it's time to whip them out.
I think I forget that positive thoughts breed a positive outlook and create a good energy in your world.
I'm in need of some reinforcement now, because really, who wants to be around a whiner? And that's how I feel right now. boo hoo.