If you need help or support, or are feeling depressed, there is support available. Your Contracting Orgaznisation and Prefectural Advisors are there to help, and if you prefer to speak with someone else, the contacts below offer confidential help and support.
Japan-wide phone support (not just Tokyo) between 9 a.m. and 11 p.m. (Japanese time) daily.
Confidential, judgement-free phone or skype support from fellow JET volunteers between 8 p.m. and 7 a.m. (Japan time) available every night. The above link also has a lot of other helpful information.