Yes, I think targeting it multiple ways would be a good idea. Shorter hair. Powder to keep it drier. Possibly a different medication in the first place.
Come on, that might work for half the year, but when it gets warm in Minnesota, it turns into (note the high Scandinavian population) a sauna. At least in Arizona it does not get muggy, even at 108°. If yeast does not thrive in humid conditions, where would it?
There is a fungus among us. I think yeast and fungus will probably do us in, in the end times. We are doomed.
The CDC has this to say:
Ringworm on the scalp (tinea capitis) usually needs to be treated with prescription antifungal medication taken by mouth for 1 to 3 months. Creams, lotions, or powders don’t work for ringworm on the scalp.
Why are you posting info on what works and doesn’t work for ringworm?
OP, I’m sure your derm mentioned yeast, but are you sure he said you have a yeast infection? Based on the treatment and prescription you were given and some other clues, such as him telling you stress brings it on, it sounds like he diagnosed you with seborrheic dermatitis. It may be yeast related, but there is no cure. Stress does not bring on infections. That is why he didn’t prescribe you with anything that would be prescribed if the issue was an infection. He prescribed you with a shampoo to manage it and a home remedy that many find helpful, and it seems to be working for you.
Ringworm/tinea/yeast/fungal infection are all names for the same thing. AFAICT, you’re the only one posting your own diagnosis.
OP, you’re gonna have to be diligent to get rid of this. No sweat, no damp, apply meds, take pills for a good while. This not a battle, but a full size war. Change your pillow cases everyday, and I like the fan on your head idea. Good luck.
No, they’re not. Ringworm is a fungal infection that is from types of fungi that are not yeast. Fungal infection is also not synonymous with ringworm. All ringworm infections are fungal, but not all fungal infections are ringworm.
No, I didn’t. I said based on varios things written by the OP, “it sounds like he diagnosed you with seborrheic dermatitis.”
Why is that relevant to mention based on me asking you why you’re posting info regarding ringworm?
Sorry, you’ll have to dance alone.
I was just wondering, would anyone care to dance? 
Yes, dandruff is caused by a yeast-and-bacteria infection like a sourdough starter, and it is treated by using a anti-dandruff shampoo. Personally, I’d recommend a zinc pyrithione shampoo rather than a ketoconazole or selenium sulfide, but for many people the zinc pyrithione shampoos make your head /feel/ worse, and other treatments make your head /feel/ better.
Treatments like coconut oil make your head feel better, and make your head less attractive to the yeast & bacteria coalition, but in the end, trying to cure by treating the physical condition of your scalp is much less effective than simply killing the yeast-and-bacteria and letting your scalp heal back to normal.
The treatment you’ve been recommended is standard, and you should be better in a couple of days. If you aren’t better in a week, I’d start to consider switching to a different brand: I have no reason to expect that all scalp fungal conditions are equally susceptible to ketoconazole/ zinc pyrithione / selenium sulfide/.
Could be worse.