Thank you for your query at DoctorSpring.com
If you make less cortisol, you dont gain weight, unless you are taking steroids which cause weight gain and that suppresses your cortisol.
I d'ont know why she took you off your pills. BRCA2+ may be the reason. You need to ask her that.
Weight gain of this degree has to be related to poor diet and exercise. No disease would cause such a weight gain without anything else being abnormal.
You need to share your cortisol, thyroid , blood sugar reports.
Feel free to discuss further.