What is recommended for on cycle gyno help? Which AI?

Letro for acute onset gyno. Exemestane IMO for prevention and after tapering off letro if it arises acutely.
BEAST
In a hurry will something like ATD or Formestane work?
Formestane can work if it just flare up. Try 200mg ED until gone..
Arimidex works..
Adex is last resort..