Oh yes, I agree the Sugar content of fruit is a problem. I avoid most fruit because of the fructose and the pesticides. The OJ is my only venture into fruit.
I thought the same as you. I have to be cured of the bad things before I can feel better. Makes sense but it doesn't work. You'll just get sicker.
I finally figured out that I have to help my body fight the pathogens by giving it what it needs to fight or taking away the things that hinder it's fight. It is a very difficult balance between killing the pathogens and feeding the body what it needs. It's a three steps forward, two steps back approach.