Father in poor health

My father is in the hospital and we are desperate for a prayer request. He has been sick for years now from fighting diabetes, kidney failure, amputations, and other medical issues. Recently we hit a speed bump again. He is now in the hospital with a possible stroke. He can barely talk or move and he hasn’t slept for three days. He came in just for dialysis and this happened. We’ve been waiting on doctors to do tests and get back with us, but they’re taking forever and I fear he’s getting worse. He’s such a devoted Christian and I just don’t understand why this is happening to him. If you could please, please pray for him.