Jessica,
Major mold and yeast problem. I would suggest doing the Mycotoxin profile from Great Plains. At this point, I agree with the Nystatin/Biocidin approach.
The high lactic and pyruvic might be coming from high Oxalate. A low oxalate program is worthwhile and definitely use some Cal/Mag Citrate with meals. A high potency probiotics such as VSL#3 is worthwhile too. I would use just one capsule nightly.
L-carnitine is worthwhile too. 500mg daily to start should be good.
NAC is not a bad idea. It’s in the normal range, but higher than most kids and the glutathione is low with the high pyroglutamic.
I hope this helps.
Dr. Woeller