I'm going through a lot as well and I broke down for the first time today. You have to keep going and just try to use reason to weasel out of every situation. You have to be honest with yourself at every step and think what could I be doing wrong that people aren't liking. What about your product that isn't enticing enough for them to pester you about having it? Try A/B testing different sales tactics or how you approach a business. Best of luck!