I have been in a very similar situation. Looking back, I wish I had first and foremost stopped putting myself over the edge. Constant overwork and unnecessary s

I have been in a very similar situation. Looking back, I wish I had first and foremost stopped putting myself over the edge. Constant overwork and unnecessary sacrifices have deprived me of the ability to properly deal with the problems including the one of undercommitted cofounders. I wish I could offer you a perfect solution, but I doubt one exists. If your cofounder doesn't care it just means you have a wrong cofounder. But you sound overly stressed and I can tell you it impacts decision making in a really bad way. So if there is any solution, to find it you'll have to get out of the "sacrifice" mode yourself first.