Diflucan is a good antifungal Rx medication for getting rid of stubborn yeast infections. I can't believe your doctor gave you antibiotics for a yeast infection, unless there was another infection as well, like a bacterial infection going on.
I went through decades from the time I was 9 till I was in my 40's suffering from very frequent yeast infections even after I'd had a complete hysterectomy. Then I found out I was diabetic. I have type 2 diabetes and take Metformin. I've had far fewer yeast infections since then and am 59 now. The ones that didn't respond to OTC Monostat or other OTC anti-yeast products that used to be RX's, responded to Diflucan. It only takes 2 to 3 tablets to get rid of it.
Go to a gynecologist to make sure it's a yeast infection instead of some other type of infection. If you don't know about your family health history on your paternal and maternal side, start asking questions to find out if diabetes runs in the family, or if other females in your family had problems with yeast infections. It was so bad for awhile with me that when I was put on antibiotics for sinus infections, bronchitis, or other illnesses requiring prescription antibiotics I'd get a yeast infection and thrush, which is a yeast infection on your tongue. Babies get thrush and children, adolescents and adults of all ages can get it. I'd also end up with diarrhea from the antibiotics killing off the good bacteria that live in your intestines. Not fun. If you've had this problem for a whole year at least consider asking about getting an A1C blood test done to find out your blood sugar levels over the past few months. If your number is high enough you may be pre-diabetic or diabetic. Don't settle for a quick blood prick on the finger test in the office or having to go through fasting and then drinking that sweet sickening liquid and having your blood sugar tested every hour for 5 hours. I did that for 3 decades and always was considered pre-diabetic. My doctor got very frustrated and said he was going to do an A1C test because he was positive I had diabetes. I had nerve damage and had developed heart disease, angina, irregular and fast heart beats.. I wasted all those years with other doctors having that 5 hour test done only to find out with a simple A1C test that I'd been diabetic for years and that's why I had such terrible nerve pain. If not diabetes, you may have an autoimmune disorder of some type, like fibromyalgia, chronic fatigue syndrome, rheumatoid arthritis, etc. If you like yogurt, eat it at least once a day, making sure it has live bacteria in it. If you don't like yogurt, consider probiotics, which are good bacteria that can help you get rid of yeast and help replace good bacteria lost when you have had antibiotics. Good probiotics often have to be refrigerated. If you douche stop. If you sweat heavily in your crotch area, consider shaving your pubic hair, I know this sounds stupid and gross to some people, and apply a light layer of stick deoderant in the cracks of your legs and on the outer skin only. Or you can use baby powder cornstarch to help keep down sweating. Don't sit around in a wet bathing suit for hours. I went through years of h_ _ with yeast infections. Once I got diabetes I started getting diabetic rashes and have to use deodorant not only under my arms but under my breasts and in my crotch area both when I was heavy and now that I've lost a tremendous amount of weight, still have to do it. I hope you find out an answer soon and get your problem taken care of. It can be miserable to live with your condition. I wish you much luck and hope you become yeast free soon.