Emotional Highs and Lows

Is it supposed to part of life that we face both highs and lows at the same time?  Recently, I have realized a dream in the opening a private school and the celebration of 25 years in business.  Against that realized dream, the news that my daughter has been diagnosed breast cancer.  How am I supposed to juggle that kind of happiness against that kind of sadness? The only way I know how to balance this is to KNOW God is in control of both. I have learned that asking why doesn't work, and resting in the knowledge that a power bigger than myself is in charge.  Today... knowing that truth gives me peace and I can be thankful.