In the following clip, the young man, who is still clearly shaken, describes the patient's condition to the doctor over the phone.
The doctor asks a number of questions to get as much information as possible before action is taken.
The young man says that Mr Lindley had a "Shooting pain" up his arm and across his chest. A shooting pain is a sudden, quick, sharp pain that causes immediate discomfort.
Mr Lindley is "Sweating like a pig." A good English expression which means; 'Perspiring in large quantities'. (Sweating a lot)
"Down one side" refers to the loss of movement on one side of his body.
"Terribly thirsty" means that the patient is extremely thirsty.