I've worked with several startup founders and a few early engineers who told me they'd been clinically diagnosed with mental health problems.
Generally I've noticed that an unfunded, stressful startup environment magnifies their existing problems.
Some suggestions to avoid a breakdown:
- wait for the right time to begin your own startup (get funding based on a powerpoint first, start a popular blog or podcast to have PR traction before writing any software, get caught up at the dentist, buy a new car if needed, see if any medication is needed/works for you, etc.)
- or join an early but funded startup
- understand that startups are usually 7-10 year marathons before the final success or failure, so you need to be able to keep it together for several years. That includes maintaining the best physical and mental health you can so you can handle inevitable setbacks. Even if you're an introvert, that includes relationships.
Starting your own company to "escape" civilization usually doesn't make sense unless you can self-fund it for several years, or your existing contacts can quickly be paying clients.
What happens when you're not prepared is that paranoia will dominate your relationships, depression will deepen, etc. so your startup marathon doesn't have a chance of finishing.
Having said that, manic people can accomplish a lot during their manic phases, but to sustain that over several years means they need to follow the preparation above.
If you're a non-technical founder, understand that engineers are very expensive to make payroll (which adds to your stress), and have options (don't really need you or other mentally ill people in their life.) So ensure you have adequate runway, or structure your staff relationships, so that you don't stall your project.
Also, in the US, ensure you've considered health insurance expenses before doing the startup thing. Most small businesses struggle with that, and it gets worse every Jan. 1.