Stepdad (64M) is experiencing severe shoulder pain and cold sweats

My mom(62F) messaged me this morning in a bit of a panic because my stepdad (64M) woke up with severe right shoulder, neck pain and cold sweats. I asked how severe the pain was, she said it was 9. He complained about it shortly after waking up, so I asked if he slept on it wrong. She said that is what she thought until he had the cold sweats. Apparently he said "I think I'm sick, grab the thermometer" they checked his temperature and it was normal. He went and sat for a half hour and his sweats stopped and color returned to normal and he said he was feeling better, the pain is now a 3.

She is still very worried it his heart. He won't go to a hospital, so I wanted to ask for opinions to see if he should go to the hospital or give this a bit of time to pass. Is this something that could come in waves? If it doesn't come back are we safe to assume he is fine?

Any advice is greatly appreciated.