lilithe1 sorry your first question received no reaction.
It looks to be an Epiphyllum and it will root easily where you cut it, so my inclination would be to just cut it at the break. Let the cut heal for a few days and then replant it and it should root.
And no we don't have a forum for plant CPR but maybe we should have one!
Plenty of mishaps happen to plants one way or another...