Well, I'm here to tell you from firsthand experience, this can all be fixed. There are multiple ways to regain your clarity but it's not going to happen overnight. Depending on how dense the fog in your head has become, it may take you 1-2 years before you get your spark back. The good news is that if you catch it early enough, it could take as little as a week. You just have to be able to see the signs of the fog rolling in and be proactive rather than reactive.
Go Outside and Play
One of the best ways to keep your sanity is to go outside and enjoy the fresh air. Go for a walk and get your body back in motion. Get that heart pumpin'! Nowadays we are so used to sitting in a chair all day, there's no wonder why so many people are lazy and unhealthy. Our bodies were designed to be limber and to move, not to be sedentary and motionless.The next and even better thing is to go to the gym at least three times per week. You must also make sure you're spending a good 15-20 minutes stretching to release all the toxins in your body (Read - 'New Year's Resolutions, Your Business, & Going to the Gym'). Exercising does wonders for your mental state. Within 30 days, you'll feel more energized, happy, and ready to attack anything that comes your way.
Take a Break
Unfortunately, you live in a go-go-go society. The world is moving at the speed of light. If you are a small business owner, you already know that taking a break can be very difficult at times with all the demands set forth. Well, I'm here to tell you from experience, this is extremely important. If you don't take a break and time to stop and smell the roses, your life will pass you by before you know it and all you will have to reflect on is how hard you worked.Ideally you shouldn't work more than 40 hours a week. Take time to spend with your friends and family as well as to give your body and mind time to rest and recover. You should also take at least one day a week to do absolutely nothing except for fun and relaxing activities.
You should also take at least 2 weeks off per year, preferably in a row. Put your work down and refresh. Go out of town and get away. Sleep as much as possible. After your vacation is over, you will come back to work ready to tackle just about anything!