What kept me going was to carve out some personal time for non-professional relationships. Since you say you can’t have these sorts of conversations with your current network of friends you should probably expand that network until you find people that you can be open with.
I moved in with my girlfriend and we built a really solid relationship.
I invested more time in friendships that I had neglected for a few years.
I also started playing a team sport which did wonders for me both physically and socially. If you’re not much of a sportsman try golf.
It takes a while to build those things though so in the meantime you might try seeing a therapist. Paying someone to listen while you vent out loud in a safe environment is actually helpful and will make you feel better. I never saw myself as the type of person who would go to a psychotherapist but now I feel that my preconceptions about that were totally wrong.
Also if you have the money for it consider getting a cleaner to free yourself of as many domestic chores as possible.
But definitely do something before the problem gets worse. Building your company is just one facet in building the life you want but if you ignore everything else you risk building a prison for yourself instead.