Itchy vagina please help!

Yalllllll I need y’all’s help lol. Idk if I have a yeast or bv at this point I feel better for a few days then the itching comes right back I’ve been to the doctor like three times maybe and they just brush me off. Should I try boric acid is that for bv only or does it treat yeast as well? Idk what to do anymore it’s been months since I’ve felt normal and I have a vaginal fissure. I’ve made plenty of posts on here can y’all tell me what made your itching stop when you experienced this I’m desperate (also it couldn’t have anything to do with me being on nexplanon right)