There is no correct order for this
There is no correct order for this. Today can be worse than yesterday and I am still moving through it.
You may have had three steady days and then woken up flattened for no reason you can point to. That is not backsliding. Grief moves in loops, not in a line, and the loops get wider apart before they stop.
Today's step: Wrap yourself in something warm and sit still for five minutes.