There must be others or someone out there that can at least point you in the right direction.
What you mention somehow reminds me of some people that have acquired a parasite 'invasion', or mold related malady. I have not read your story (sorry - working and taking some time during break) but there has to be a turning point that should lead to the clue that can guide your search for a solution.
So young, you must feel desperate but life is so worth fighting for.
Please don't give up...
Think about it: (quoting Moreless here): 'Cause and effect'
Something must have caused this to start - so somethings must be available to resolve it.
All my best wishes and many blessings....
MadArt (ist)
BTW: Candida does sound like it may be a piece of the puzzle?