As long as you're functioning (which it seems you are to some sufficient degree), I wouldn't expect drastic measures. To try another angle, do you have a mento

As long as you're functioning (which it seems you are to some sufficient degree), I wouldn't expect drastic measures. To try another angle, do you have a mentor/supervisor? If not, maybe look out for some experienced (potentially retired) manager that you trust. There are also professional services in that space. They may not know your business, but they know the responsibility you feel for keeping things alive. They might be able to help with the culture shift issue you mentioned elsewhere but also with management in general (including "how to make sure that the company doesn't have a bus factor of 1: me") and self-care - one low key strategy in that regard might be to hold you accountable to certain habits that you agreed on (eg. "eat twice a day"). Speaking of which: got something to eat yet?