If it is yeast then they can’t prescribe any drugs to treat it. There isn’t one single drug created to treat crc (candida related complex) there is only antifungal drugs (which may or may not work). So this is why most western doctors cannot do anything at all.
This is why you have to find specialists and find ways to fight back against western medicine via alternative doctors (be it methylation doctors, chelation, digestion doctors, ones that believe in yeast, etc). What you need to look for when you talk to these doctors is ones who have decades of experience, ones who treat underlying symptoms, and ones who have successful treatments for the same exact problems your son has gone through. If they don’t have any success stories treating someone with whatever your son is ill with then its not worth it imho.