Being an entrepreneur is a roller coaster ride with so many ups and downs.  You can't get too high with the highs and you can't let the lows take you out. 

And when you look back at it, all the memories that you have are going to be along the crazy journey from your garage, to your first order, to the time you almost lost it all to the time you finally got that first big sale.  

Enjoy the journey while you are in it and embrace the tough times and the friendships you make along the way.