Looks like my dad suffered a small stroke. Basically he has paralysis of his esophagus and this is preventing him from being able to eat anything at all including drink anything at all. Makes one wonder, the quality of his life from now on will definitely only go down, this will definitely effect his immunity to many different illnesses such as the common flue which could possibly kill him if he ever gets sick again. He will have to be hospitalized because the mucus will no longer just go down into his stomach. More updates later.