How do these doctors or nurses do their job?

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I was the care giver for my aunt a couple of times when she was hospitalized. Luckily, first time it was an infection, and the second time, it was hip surgery. The patient next door had cancer. He was young...meaning around 45 or so. Stomach cancer. The whole day he would be screaming with pain. Then doctors would prescribe something, it would be given intravenously I think, and then he would pass out....for a few hours before restarting. His wife would come out of the room. Now and then....must be difficult to watch loved one in that much pain. At my end, I felt, oh god, so this is cancer. Please don't give me so much pain god. If you kill me, make it swift, less than a few seconds. It made me respect my body more though pickles still are very much part of my diet. All I can say is, even though I was not related to that person, I felt the stress, because I kinda extrapolated the situation to me. Do physicians and nurses not do that....and if so, they maybe under terrible stress, isn't it? Medical profession is scary.