Why did you decide it was all real or all fake?
A sad time when someone dies and someone being diagnosed with cancer and then living with it is difficult.
I still have faith that it is 'all real' and I was surprised when I came on this site and found lots don't after being a Witness.
There is someone that I know who is struggling with their faith and belief in God and I said they should speak to the elders which they did. One of the elders is quite elderly and he gave a couple of experiences in his life that helped him have faith. It didn't help much from what I was told, the person hadn't had the same experiences themselves . My experiences and my reasons I don't think will help either. I don't know if there is just one thing although sometimes I think there is.
I have always found prayer helpful.
As others have said I am sorry to hear of your loss