Christmas Blues?

I am down in the dumps this evening and I have no idea why. I have had a really great few weeks in business, my daughter was ultra sweet today, my husband is great, my new dishwasher rocks but somehow still feeling a bit sad at the moment... I think that I am worried about being in business for myself. My husband has been really supportive and my sales have been scared but I am scared that things will fall through the floor after Christmas. I know that I should have confidence in myself and stay positive but right now, in this very moment I am filled with self doubt. Sometimes I think I am my own worst enemy :(