1/ uncertain & dark the days of building a business are 2/ you're at the mercy of randomness (despite having a strong sense of agency)
In that sense, a few books that tell you that darkness is a rite of passage for building great companies would be
1/ Soul of a New Machine - http://www.amazon.com/Soul-New-Machine-Tracy-Kidder-ebook/dp...
2/ Fooled by Randomness - http://www.amazon.com/Fooled-Randomness-Hidden-Markets-Incer...
3/ Coders at Work - http://www.amazon.com/Coders-Work-Reflections-Craft-Programm...
4/ The Innovators - https://www.goodreads.com/book/show/21856367-the-innovators
5/ The Hard thing about hard things - https://www.goodreads.com/book/show/18176747-the-hard-thing-...
6/ Are your lights on? - https://www.goodreads.com/book/show/11221270-are-your-lights...