Exit out of the game and go to your settings. You can retrieve cloud saves, if you are a PS+ user. Check the date on the save and see if it's worth doing. It may be a day old, or possibly a few hours.
As an aside, if you find any Umbilical Chords, don't consume them. That way, you can use your save to get all of the endings without replaying the game completely.
Hmmmm, I've made it to the defiled chalice. Haven't done any roots, and skipped Lower Loran chalice.
each depth 5 root has the possibility of having a blood rock in it. Once you find a rock in that root though future rocks are converted to Great One's Wisdom, so you can only get 3 out of chalice dungeons. A decision I find slightly frustrating. That and the decision to so drastically limit chunk farming