A dear friend of mine suffered from a long term systemic fungal infection, so I do know a little about it. Her dr told her it's like having a yeast infection in your system that pops up in any damp, dark, warm spot that can ake you miserable. She did finally get rid of hers by following a specific diet and taking anti-fungal meds for several months that included eliminating sugars and carbohydrates from her diet. I did some research online and found the following link that tells more about it. I hope it helps! I know my friend was truly miserable with hers.
http://www.ei-resource.org/anti-fungal.asp