If I were you I would try to be realistic and cut my losses. Follow the advice of getting an accountant and focus on what is important for your company. If you had a good reason to start it then you should persist if it is appropriate, however if you where dreaming too much either change your priorities or cut your losses. Its your money at the end of the day.

As in terms of career wise I dont think a failed business is such a problem - as long as you can sell it in a positive light. Career wise being an English teacher is the bigger problem I think. Many People that I know from Asia - foreigners and natives - look down on these so called "white monkey jobs".

Also its strange that you use "suicide" and "my actions to reflect badly on other foreigners in Japan" in the same paragraph. If you are depressed you shouldn't care how other foreigners look by your actions.