Ok, u do not have a cancer but STILL too much Sugar is Not good even the very natural one... and if u are anyway more then open to try Everything just to be healthy then u Could take my advice into account.
Another thing which came into my mind which Could help u alone with a Water Fasting and other thing u try... Have u tried VISUALISATION tecniques? Just seeing urself healthy and happy and may be even visualise how ur trumor is REDUCING... u could try doing it every day when u are able to realax with closed eyes (perhaps bed time could be more perfect). I heard visualisation methong of Jon Gabriel is quite effective though not sure about the details of it.
Thoughts are things - u remember? So BELIEVE that u will make it. I do think u need to use Visualisation in ur case. Try.