Yeast infection

I got a new sex partner and we’ve been having sex for a little while now and I notice everytime I have sex with him or receive oral sex I get a yeast infection. This is my second yeast infection this month (literally one week I had a yeast infection and then another week I went through treatment and now this week I have another one) and all of my std screenings are coming back negative. Rn I’m a itchy, swollen, irritated mess can y’all please give me tips on what I should do because I’m struggling right now.