Finding Peace After Losing My Father

Assalamu alaikum. My father passed away five days ago, leaving us heartbroken. He had a heart attack and pneumonia, and was on life support for a week. During that time, his heart stopped three times, until my mother, may Allah grant her strength, asked the doctors to stop CPR as it was causing him unnecessary suffering. He left this world peacefully in the hospital room with my mother and brother by his side, and I arrived half an hour later. For the past two years, he also struggled with dementia, and that was a trial in itself. To anyone else who has lost a parent, how did you find patience and bear the pain? I'm seeking advice and comfort from my brothers and sisters in faith.