What are those successful business ppl doing to help? Giving you money? Ask them to help even more by giving you enough money to hire an extra person that can run the startup for a month or 2 until you destress.
They're contributing in work, mainly sales and business development. Unfortunately I'm the only one who knows the whole codebase and it's not trivial to find someone to whom I can hand it over. I know other well-funded startups having the same kind of problems with finding skilled personnel.