Cat is right about music, I can change my mood just by listening to "Boots" on his sax, or a favorite happy or funny song, I love country gospel. Keep your mind on other things, positive things. Always remember there is a lot in this life to celebrate.
Chamommile is good, if it doesn't help oatstraw will. I use St johns wort tea for relaxing in the evening before going to bed. Most herb stores have all of them in the leaf form for tea. Just steep a teaspoon in boiled water for 6 min strain and drink. For a really good flavor add a small amount (1/4 tsp) of peppemint and 1/2 tsp of catnip to the st Johns wort.