For the second time in a couple of months my adult daughter has experienced what she first thought was bad heartburn. She said it was a burning with a bit of pressure in her upper chest then her face would turn red and she would break out sweating heavily and the burning became painful. Both times she was taken to emergency where they ran several tests but did not find a cause. The symptoms lasted about an hour she did take Zantac and Tums when it first started but it did not help at all. Anyone have any ideas on what could be the cause as I know something must be wrong but we are at a loss?