“Stress causing shakes?”

My mother in law past away on Jan 7. My father-in-law isn't handling it well. His stress level is obviously really high. His chest hurts all the time. He has slowly been getting worse little by little as the days go on. Today has been the worst so far. He woke up and said it started with his fingers twitching, then it moved up his hands, up to his arms, into his shoulders, and now even his head is shaking. He was sitting and rocking involuntarily earlier. He hasn't been sleeping much. Barely eats. I know someone grieving shouldn't be alone, his daughter and her husband live with him. But they cause more stress than they help. So I try to sit with him as much as possible. But I am really worried about him tonight. I'm afraid he's showing signs of maybe a stroke? His blood pressure keeps spiking. It will go back down after I sit with him for a little bit. I sit with him at night until he falls asleep. But when I wake up in the morning, he's already awake and messaging me saying his blood pressure is already high. And his chest is already hurting. His eyes look a little swollen tonight also. But now that I've been sitting here with him for a few hours, he said his chest isn't hurting as bad, and he has stopped shaking. Was he trying to have a stroke?