What Is Barzakh? My Grandfather Passed Last Week, and I Need to Know if He Can Still Hear Me

Assalamu alaikum, everyone. My grandfather was the most important person in my life, and losing him has hit me really hard. For years, he was very sick, but he always managed to recover. This time, though, his body just couldn’t fight anymore-his organs failed. He suffered a lot, yet he never once complained. He stayed so positive, and what hurts most is that he truly wanted to keep living. I know this was Allah’s decree and that his pain has ended, but I still feel so angry. I prayed constantly-Salaat ul Haj, Tahajjud, every dua, every salah-I begged Allah to heal him. But now he’s gone, and my world feels shattered. No matter what I do, I can’t find sabr to handle this loss. How do I cope? What should I do? How can I rebuild trust in Allah? Even when I pray now, I feel hollow inside. Every salah feels empty. I’m so frustrated, and I miss him terribly. I miss my person. I’ve been wondering about Barzakh. Does he still miss me? Does he remember me? Will my duas, recitations, and nafl prayers reach him? My grandfather didn’t pray all five daily salah, but he was the most honest, fair, and upright man I’ve ever known. He helped so many people, touched many lives, and gave lots of charity. His janaza was on a Friday, and I heard that as he was lowered into the grave, heavy rain suddenly fell-it was almost like a scene from a film, raining only during those moments, then stopping. But he didn’t keep up the five daily prayers, and that thought scares me. I’m worried about where he is now. I know I can’t bring him back, but I need some understanding of his state. Please, if anyone can share what they know, I would be so grateful.