Its interesting, no one told you to quit. I'd check on sleep deprivation first. Take a week off, sleep 10 hours every night, exercise every day lightly (long

Its interesting, no one told you to quit. I'd check on sleep deprivation first. Take a week off, sleep 10 hours every night, exercise every day lightly (long walks listening to music are good), read a book. If you do all this and you still think you're at the end of your rope then you need to talk with your cofounder. You also said it isn't affecting your work yet, but people are smart and social signals are sent without even realizing it. Its impacting your work already, in little ways, and will only get worse. Deal with this now, don't wait.