Granny, I have some thoughts about your yeast problem...
Perhaps the dr can give you a topical spray for pain relief so you can use the nursing pads that Nancy brought. I think it's important to reduce the amount of moisture and pus on your skin, and it seems obvious that the powder is not enough. Maybe once the pads are in place they won't hurt too much.
Not all honey is created equal. Most of the cheap stuff (especially from other countries), regardless of what it says on the label, is actually corn syrup mixed with a small amount of honey. This will make your yeast worse... it will grow because the sugar will feed it.
Raw organic honey (like manuka) is the only type that may help because it has the antibacterial properties and might kill off your yeast. If you do try it, choose a small area to test for a day or 3 before smearing it all over.
Same idea about trying the yogurt. Only plain (organic, if possible)
sugar free yogurt with active cultures has a chance to work. You can buy a small cup for buck or so, and give it a try on a small area. It can't possibly smell worse than the yeast, so don't be a baby!
There are a lot of home remedies you can try, but some of them, like apple cider vinegar, sound too painful for your case. Coconut oil might be an option. This article has ideas for home remedies.
https://pharmeasy.in/blog/try-these-simple-home-remedies-for-fungal-infections/
Your diet can make a difference. Cut out sugar sources because sugar in your blood stream is food for yeast. That means no starches (anything made with flour, rice, potatoes, etc), no sweets or fruits. Watch out for hidden sugars. I bet your creamer has some sort of fructose or corn syrup in it. It's not helping you. Neither is the caffeine in the coffee. Caffeine is notoruis for causing inflammation throughout the body.
BUT, I think your cigarette reduction program is most important, so don't deprive yourself of your favorite drink and risk the success you've had so far.

(Maybe try a half decaf mix and find a sugar free creamer?

Or not.)
Have you ever tried Ketoconazole? It's an antifungal that's in Nizoral shampoo, but you can also get an oral dose with prescription. Not sure about taking it with all your meds. I just know it worked for me. Years ago I started getting what looked like cradle cap in the hairline of my forehead. I tried regular dandruff shampoo, but no luck. After 2 yrs (!) dealing with it, my nurse friend told me it was probably yeast and go buy Nizoral. It was like a miracle cure! I wonder if you could use the shampoo on your skin... or get an oral prescription.
Last thing, I know my dad would recommend, is colloidal silver. He's cured all sorts of skin problems spraying it on topically. It has been used for centuries, but most drs consider it snake oil. Not many studies have been done, but throughout history, silver has been used as an antibacterial. Pioneers and sailors would drop a silver dollar in their water or milk containers to keep it sterile. Cruise ships today use a form of silver in their fresh water storage tanks. Might be worth a try.
In your shoes I would definitely try something. The only risk for most of the remedies, other than not working, is not killing off all the yeastie beasties, and possibly ending up with a strain that becomes immune to treatment. Seems to me that may have already happened for you, so trying an alternative could be worth it.