I did a period of two years as the CEO of a smallish tech-company (~ 100 employees, turnover of 15M€) and it was stressful as hell even if we were doing OK financially. The big thing is that you're the last defender, everything difficult or uncomfortable task ends with you having to pick it up, for everyone it's a choice to pass it on to the next level but for you it isn't. This combined with the monthly "grades" in terms of commercial result which was new to me coming from a tech background was tough. In the end I chose to go back to tech but it's not something that I want undone, it was a learning experience and these days I'm a lot more careful to let things slip through to the next layer.