I’m so sorry to hear about your dad's health problem. I know how difficult it must be for you to see him go through so much pain. I just said a prayer for him, asking the Lord to touch him with His healing hands and surround him with His strength. Take comfort in God’s mercy, and remember the words of the apostle James: “The prayer of faith shall save the sick, and the Lord shall raise him up...” (James 5:15). Grace and peace to you!