Go talk to this person, and accept the job and help. Ignore the thoughts you can have on refusing this person's help. Do the job without pushing yourself too much. Use the money to follow a therapy and to try new things as silly as they may seem (workout, meditation, sophrology, hypnosis...) as long as they are not harmful (drug consumption, gambling...). Let yourself at least a year before considering suicide as an option.

Good luck in your life. You are rock-bottom in your life right now, but that does not mean you cannot have a good and happy life later.