Whenever we feel negative emotions, it's a direct result of stressful thoughts we are thinking. Stressful thoughts are always about something from the past we can't change (guilt), something in the future we can't control (anxiety, fear) or wishing that something wasn't happening the way it is (should's or should not's).
Check out this "2 Minute Tip" to learn a quick and easy strategy for calming that excessively busy mind of yours.
It's called "B & B: Become Aware and Breathe."