muscle spasm
"I was prescribed Lorzone and was given a sample by my doctor. I took medicine around 6 PM went to bed at 11. Woke up at 1 pm with a condition very similar to getting a piece of food stuck in esophagus. I could breathe, but was unable to swallow. My saliva became thick and foamy and  had to spit it into a cup. Had my wife take me to Emergency room. Had an endoscopy which when I woke up I was fine."