Entrepreneurship is like a computer game in which you have to master every level before achieving success. Startups repeatedly stumble and have to go back to the drawing board. The best way to skip some levels and to increase the odds of survival is to learn from others who have already played the game.
When I start getting embroiled in heated debates and feeling stressed, I just turn everything off and disconnect from the world. I simply tell my colleagues and friends that I am not well and need to cancel all meetings for a day or more. I take it easy - go for a long hike, take a vacation somewhere, or just stay at home and read.