Has this happened to anyone else?

So i had gotten a yeast infection after getting a new brand of pads and i went to the store and got yeast infection medication and i got one that was expired by accident and didn’t realize until after i used it (it expired this month) and my yeast infection calmed down but didn’t go away completely then i got my period and i wasn’t experiencing any itching or any symptoms of a yeast infection but the day after it ended (today) my vagina has clumpy discharge, it burns when i pee and it just really hurts over all. For some reason i get like 3 yeast infections a year i dont know if its my diet or something worse? I got tested for stds last year in may and i was clean and i am&was in a monogamous relationship when i got tested and trust me we’re way to busy for cheating to be an option we literally have no lives beyond spending time with each other basically so an std is very very unlikely. Could this be a Medical condition?