Relentless yeast infection!!!! Help!!

So it’s been three weeks. Took everything possible. It has traveled near my butt now (tmi)... I am on nystatin powder.. third day tomorrow and it seems to help but it isn’t gone yet. My vagina seems to have improved but he backside is torture. I have put Apple cider vinegar on it.. witch hazel.. aloe.. oatmeal.. coconut oil, even alcohol to stop the itching but my midwife said no to that. Lol it burned like hell anyway but so did the Apple cidar vinegar because I didn’t dilute it. 😂 anyway I did nystatin cream mixed with clotrimazole and that helped with vagina but not the backside.. I did monistat too.. 7 days. I am out of ideas ladies?!? Maybe I need to be patient with the nystatin powder but I am also worried that I will deliver and have yeast hanging around.. I am 38 weeks!!! Ugh