I am not in that position, but I have a few friends that are. My advice would for you to hire a COO - I say hire instead of promoting because I am assuming that if there were someone with the skills for the job you would already have noticed and not be feeling that much pressure.

A non-technical COO can be helpful to discuss the vision of the company and share the responsibility to execute it.

A friend of mine is Co-CEO with 2 others. It works great for them (but they know each other for some time). The key is that anyone of them can make most decisions without consulting the others.