check the back of your tongue. Does it look as if there is fungus on the back of your tongue? If so get a tongue tool located with the toothpaste, and scrub it off. Use a good mouth wash and brush like you are suppose to. Should go away. If its not this then go to your dentist
Try getting tested to see if you are diabetic.
sorry, this is a mental health forum, you might try one of the other doctors who knows about these kind of issues.