Unpleasant discharge TMI

I have a really unpleasant discharge, and it isn't very pleasant. 
I bathe in the morning, wear clean cotton undies and by mid afternoon I can feel that I need to shower again. 
My undies become wet and covered in this white discharge. 
My partner doesn't like that I won't engage with him in intimacy unless I shower first and he says it ruins the mood. 
I get yeast infections sometimes and take the tablet and it goes rid of it. But this discharge is always there! 
Please help me !