Help!

So I’ve been having this strange irritation type of sensation down there. It started in March it was really bad in the beginning but I started taking yeast infection pills and the symptoms went away. But as soon as I stopped taking them it would return. I’ve tried both the azo pills and the pills my doctors subscribed me. neither really helped. I am sexually active and after complaining to my mom for 2 months I decided to get tested behind my moms back at a local clinic. Thankfully everything came back clean but the problem still occurs. It stopped for the whole month of June but retuned in July. I’ve voiced this several times to my doctor but she kinda ignores me she thinks my ph balance is off since I only have the itching and irritation and no strange discharge or smells. She says yeast infections can’t go away on their own so it’s not very likely that I have one. I really want to go see a gynecologist but my mom and doctor both kinda brush me off and It’s really uncomfortable. What do you guys think this could be ? & my triggers are sugar! It definitely gets worst with sugar.