You health should be your top priority, as well as your ability to go on vacations. So put the business nr 1 for sale and see if you can get a good price for it.
You are obviously a person who can create a successful business. I think you should sell it, take it easy for a year, do some travelling. And when you are healed from your burn-out, see if you feel like creating another, not so high stress business. Or become a consultant in advising others on how to create a successful business. And only do that, if you need the additional money or need the mental challenge.