Hi @Molly71
It seems to be very common to have a bit of an emotional crash when active treatment ( I mean surgery, chemo radio) ends.
Add to that if you are on hormone therapy often it mimics some of the side effects of menopause including mood swings ☹️
What works for one might not work for another.
Seeing a psychologist might help.
As might keeping busy .
I find having something in my diary to do every day helps ( I am semi retired ) as well as always having a holiday to look forward to ( however short).
It will get better but in a lot of ways it’s like moving through the various stages of grief - what you are grieving for is your formerly bulletproof self.
Take care 🌺