I can offer you at theory, but it'd be pure speculation. Even if I was right on the mechanism, you would not find any literature on it. This is the problem at hand. Theoretically, arimidex should absolutely not cause any persistent issues; its a reversible inhibitor of aromatase. I do not think it was the arimidex
itself that caused it.
I believe that there was some autoimmune negative feedback on the receptor and its post translational products. Think about it in a way that a wire has been tripped. There are ton of different co-regulators and proteins that mediate how nuclear receptors work, a lot can go wrong. I can't say I've brought my estrogen to zero and this is what caused it because I'm sure many guys have done the same and this didn't happen to them.
I believe that it is most likely epigenetic etiology. We were not born with a congenital condition and it is extremely hard to alter the genome.
This is simply speculation but I gave it the best I had. I think it's better to think about what we do know.
1. There are a vast amount of people who have used different kinds of
inhibitors that now have persistent side effects after stopping the drug. E.g Finasteride, Accutane, SSRI's, and now, AI's.
2. It seems that the persistent side effects are quite specific towards what was inhibited. People who have persistent side effects from Finasteride can still get estrogenic side effects but have problems in the tissues that are androgen dependent. E.g penis shrinkage,
testicular shrinkage, zero libido, impotence, loss of beard growth, bone loss, pelvic/prostatic pain, muscle wastage, loss of oil production on scalp, no energy, horrible sleep. I still have all my energy, can grow a thick beard, I have little libido, no shrinkage, but I have many low estrogen symptoms such as dry skin and unhealthy looking skin, complete loss of sebum production, scalp hair loss that is diffuse, loss of 50% hair on my arms and legs, but the hairs that still grow, grow fast, extremely flat muscles, loss of blood flow (less veins, get cold easily, lower blood pressure 128/82 to 114/65), gaining fat easily, no pumps, skin doesn't get flushed anymore like it used to do when I worked out, cold/clammy skin, slow nail growth, loss of appetite, loss of aggression, loss of nipple puffiness that accompanied high estrogen levels (no tissue growth though), loss of mild lactation, difficulty connecting to others, sometimes feel derealization, short term memory loss, and some anhedonia.
3. The severity of this was inducible. I didn't have half of these symptoms back in June/July, but every time I
increased my estrogen, existing symptoms got worse, and new symptoms appeared. Guys who claim androgen insensitivity from PFS, say the exact same thing as me- increasing androgens makes their symptoms worse, and usually permanently.
4. I've used arimidex for the last 3 years. I've gone a little too low on E2 before using slightly higher doses of arimidex. Never has it gave me persistent side effects, and any side effects that I would get from low estrogen, would resolve in 4-5 days maximum. The persistent side effects that I have currently, have never occurred in my life. IT wasn't until I used large amounts of arimidex, 3-4x the amount I usually did, did this incident occur.