I read a wonderful article from a newsletter sent out by Confidence World. It talks about how you are feeling at any given moment has to do with three things:
1. What you are focusing on- what questions are you asking yourself, are you seeing things positively or negatively?
2. How is your physiology- are your shoulders slumped or held high, are you breathing well, are you smiling?
3. What language you are using- are you incensed or annoyed, depressed or a bit down, exhuberant or happy?
Each of these things are in your control, so you are able to change how you are feeling in a moment!