I have read through all of your posts today GRL (stuck in bed with white-knuckle anxiety). I identify with so much that you have gone through. My life has effectively been ruined due to hormones. I have been misdiagnosed with everything under the sun (bipolar, chronic fatigue, IBS, depression etc) but it has dawned on me that all of my problems have been due to bloody hormones.
I hope that you don't mind me saying, and I could of course be wrong, but I do not think that you needed the oestrogen (that your oestrogen was high enough) and it was the antidepressant that brought you relief (not the Studd protocol).
The reason I am telling you this is that I feel that without oestrogen you may not suffer as dreadfully as you are anticipating and that the sertraline might keep you on a semi-even keel.
I feel so dreadfully sorry for you. I regularly feel the anxiety (scratch my skin off variety) that you experience and I have always had the sudden and dramatic changes that you mentioned (I always called them my switches). I have so many similarities to you and, after decades online and on forums for all manner of conditions, you are the first person that I can truly identify with.
I so hope you are surviving this ordeal. No one should suffer as much as you have.
Rollercoaster X