If you cannot operate a business, then you can have accountants wind down the operations of the current business. This will not reflect particularly poorly on you, especially to the extent that the business was more a paper entity than something with material operations. (Failure at running a business is not exactly prized in Japan; infelicitous choices in paperwork can be taken care of.)
I would be happy to give you the name of an English-speaking accountancy in Tokyo that can help you with either of the above. Please feel free to send me an email; my address is in my profile.
You should probably speak to a mental health professional. I don't have a great recommendation for one here; consider asking your friends or, in extremis, your local city hall for a referral to an English-speaking one. If the health-oriented parts of city hall don't have a ready answer the internationalization-oriented part (hopefully) does; this is a Top 10 ask for them.