Olive oil is a pretty weak antifungal, so I wouldn’t worry about trying it as an antifungal.
Oil of oregano can help with constipation. How many drops a day are you now taking?
Normally a lot of 100-1500 mg doses of vitamin C are needed to relieve constipation, taken about 45 minutes to an hour apart.
Nutritional Institute carries the probiotic on Amazon, and they pack it in ice before shipment.