Loss of Mam

I've just recently lost my Mam to ovarian cancer. She was diagnosed two years ago but done quite well for a good while after chemo. She was such a strong woman and fought it till the very end. I keep replaying over and over again how awful the disease was and how the last couple of months played out especially the last couple of weeks before she passed. The deteriation was horrendous and I don't seem to be able to get it out of my head. Has anyone else experienced this and any advice how to deal with it. Thanks