I had what I assumed was a yeast infection, but I've now had a couple over the past year and am wondering if it is something else. I've been looking online, and of course freaking myself out about having an STD. It's been a few years since I was treated, but I've only had one partner since I've had these yeast infections. I'm wondering if STDs like gonorrhea can come and go. Most of the time I feel fine, great even. So I'm just wondering if they can "flare up" at different times.