Yeats infection or BV?? help!?

I have been getting a curd like discharge for awhile now that ranges in color from white to a light greenish and has a bad odor sometimes. I read on a website that severe yeast infections can have those symptoms. When im on my menstrual cycle the discharge goes away and then reappears after...what can this be?? i haven't been ually active in a year. also i noticed when i eat a lot of sweets i get very irritated down there and the discharge worsens. Help!