Hi this is a question for my grandfather. He's a park ranger and he was found slumped over in his vehicle. He cannot wake up and the tests they took for heart attacks and strokes came back negative. He's breathing but they have him on medication to make him sleep. He's 74 years old, he's had lung cancer that was removed, a quintuple bypass surgery on his heart, and prostate cancer, but all of these have been treated. He also has diabetes. No one seems to know what the problem is so I was just looking for a second opinion. Thanks!