Normally there are three thoughts running through my head - exercise, food and art! Interesting mind I must have.. :) no but I've always been a thinker, and I've found that my head calms down either when I run or workout, or when I paint and get into a "flow". Those things are the best kind of therapy for me.
Can't remember the exact percentage, but between 75-90% of your thoughts are the same as yesterday. Thus, replacing "bad" thoughts with good ones is a long process. I'm pretty happy with my mindset nowadays (haven't always been though). Of course I have my worries and insecurites, but I have reached a new level of harmony, especially thanks to all the time I spend painting.
Another thing I am very happy about is the weather. S P R I N G, just saying! If you are going to guess tomorrow's weather, the safest guess is to guess the same weather as of today (there are studies on the subject). Therefore, I'm hoping for sun tomorrow too :)