yeast infection from head???

Daisy • Got my three princes 👑 Aaron,Julian and baby Aydan. 👸🏾👦🏾👦🏾👶🏽💋
Hey ladies so I noticed every time my boyfriend goes down on me I get a yeast infection 
I drink water I eat very healthy I don't wear tight clothes and I don't use soap on my vagina 
And all I wear is cotton underwear.
Well my boyfriend suffers from very bad breath to the point you can smell it in a close room I've told him his breath smells but he don't believe me.
I told him every time he goes down on me I get a yeast infection now I'm so scared 😳 for him to even lick it 
Is this possible or am I just crazy