nasty taste in mouth?

for me its really not so much my mind telling me to eat to break the fast more so the nasty taste in my mouth due to bad breath of not eating etc.. it makes me sick to my stomach and I find i need something in my mouth.. brushing teeth is even worse especially w/mint toothpaste.. ive done that and the listerine.. and it just 'covers it up' and makes it worse IMO, any body have any hints and what not? maybe a tongue srcubber? Tweet