I have a Metformin (large) tablet lodged in my lower esophagus. It has moved down to the lower area of the esophagus, but won't go further. This has been for about 3 hours now. At first I could take small swallows of liquid, but now there is excessive mucus blocking the pill. I am in quite a bit of pain, and mu throat and esophagus are really hurting. What can I do to aid in getting the pill to move into the stomach?