Yeast infections

I'm 6 months PP and I keep getting yeast infections! Actually I feel like I've had a constant one for months. I have a Drs appointment on June 5 but I wanted to see if anyone else is dealing with this. I'm breastfeeding and I haven't gotten my period yet. I don't know if it's from hormones or if I'm eating too much sugar but idk what to do. I used Monistat 3 and it came right back 😞 Any advice?