Don't take it the wrong way, but there are some unresolved problems that most probably caused your current feelings, you should make a list of them and try and

Don't take it the wrong way, but there are some unresolved problems that most probably caused your current feelings, you should make a list of them and try and solve them. It is not possible - no offence intended - that you managed to lock yourself in a position such as the one you described, where your product/company/service/whatever can't live one week without you in the office. And by the same token it is not possible that someone - knowingly - is going to give you money for something that can only work if you are not only at the steering wheel, but also doing the most relevant work all the time (it would be far too risky). Now that is more clear that the offer is actually largely linked to future earnings (and obviously your future work) it sounds a lot like they are buying you and your competences (and not your company/whatever). Maybe you should really talk first with someone that can help you with your (momentary) crisis (that would be psychological support, if you can stay away from prescribed drugs would be advisable) then - as soon as you have regained some objectiveness and a peaceful state of mind - take some time to talk with your immediate associates (be them co-founders, executives or employees) and try to make a plan to solve those problems (which seemingly essentially revolve around either missing resources in the company or missing attitude to delegate some of your work).