So here's an update on my father:
He came home Tuesday night. They determined (somehow, I don't get doctors these days still, lol) that he had a stroke on Monday morning. They think it was caused by the hole in his heart that they found (that nobody knew about because he's never had heart problems) because it had a clot in it. He also found out that sometimes (like very very rarely) he has an irregular heartbeat. They also determined that his good cholesterol was too low. So now he'll be taking a blood thinner to reduce the stress on his heart to pump blood through it. They also put him on a drug to increase his good cholesterol (I can't remember the name of it, but it's very common). So now we're having to change our diets a bit overall, low/no sodium and a limited amount of leafy greens. He goes back to the doctor tomorrow to check his cholesterol levels.
Thank you all for your prayers! I'm just glad everything is going in the right direction for now. :)