Blue Happiness

Is it normal to go through cycles of Happyness / saddness?
I'm starting to notice a pattern in my emotions. I go through a period of several days great feeling and very energetic and happy, followed a few days of low energy, "blue" days. Is this normal? At this moment I feel that nobody I like and is very depressing, but the next week, probably feels just the opposite.
Yes, it is normal, and even more than usual when you're a girl. Her menstruation cycle plays with your hormones and even affects their feeding behavior. Try to do some research on how to work around this cycle over a period of 28 days of menstruation.
Follow That Bird – Blue Bird Of Happiness