Verzenio tolerance/treatments

At my last visit my breast oncologist threw me a curve ball.
She wants to start me on Verzenio in addition to my AI - Exemestane - which I am currently taking.
It's my 3rd AI, could not tolerate Anastrozole or Letrozole.
Honestly I know nothing about this drug, obviously must educate myself. She told me 3 possible side effects: low white blood and red blood counts (prone to infection and anemia, fatigue) and severe diarrhea and gave me a hand-out to read. I had 1+ lymph node and stage 2-3, BM. She said I would be "approved" for this drug.
For those of us on Verzenio already, how are you tolerating it?
I know everyone responds differently to each medication.
Some thoughts would be greatly appreciated.