>I quit sugar for about 2 months and went into an inexplicable depression where I was having suicidal thoughts.

Hmm, I had the opposite. Cut sugar for ~2 months, lost 20 pounds, never felt better. Was doing a variation of the low-carb Atkins-style diet.

Had to stop it because I got gout from eating too much meat though, but looking to restart it with adjustments for that.