I sometimes get headaches and a sour tongue and even after drinking pando i don't get well?

Mouth breathers : If this happens following sleep, it’s possible that you breath more through your mouth ( mouth breather ) and it’s possible that you may have obstructive sleep apnea ( someone will have to observe and see if your breathing is loud, and if it’s that is a clue): your tongue dries up during sleep and there is some build up of carbon dioxide that may contribute to headache.