It could be as simple as Sugar consumption feeding the candida yeast and adding toxins to your system.
That could be why you feel better when off the sweets (probably is).
I can related to the ansi feelings, wanting to reduce the stress. I disagree with popular opinion that says that our bodies wear-down and disease is inevitable. It is all about the junk in us that doesn't belong there. You were healthy until you became unhealth, emotional or whatever, but stress is not just from our emotions, it is related to how our adrenals are feeling. You can never separate your emotional homeostasis from your body homeostasis. The only exception is when it is caused by a spiritual entity who has gained access to our body/emotions. I've experienced this, too. Very often fear comes in this form, and med's will not work.