It is normal to lose focus, motivation and get stressed but the most important thing is the ability to push through in stressful times and put all your strength into business productivity.
You can refuel your productivity without buying fuel, smiles. You can put in that stress into productive activities like delivery, team work and investment.
When you are stressed, you feel worn out because a lot is demanded from you and failure to deliver makes you look like a mess.
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Every entrepreneur will go through this stress, Yes but the best thing to do in this period is to
1. Follow your Passion;
2. Get best partners/team to take up from where you feel down;
3. Track your progress;
4. Praise your self.