You should take a B-12 supplement. Also if you are in an area where you cannot get enough sun, then supplement with D. Also there is a group that eats 85% raw and 15% cooked foods as a reward at the end of the day as a reward. It is agreed on by raw food people that they have the best natural healing testimonials ever.
Also most of the need for food is emotional not physical. That is how people can fast on pure water for 40 days. So you need to take care of your emotional self.
Consider this. If you are miserable then the shorter you live the better since you will suffer less. I learned from my mother's mistakes. She was a chain smoker and hated being alive her whole adult life.
Maybe I would be too if I was addictted to nicotine. She died at 46 from a stroke and she finally got what she wanted. Note she was too proud to commit suicide and be remembered as a coward who could not deal with life. Personally I believe she would be a very happy person if she was not addicted to a narcotic.