A couple of years back, I consulted a Prof. of Endocrinology about my ED problems. He gave me a comprehensive blood test and the only significant abnormal result was E2 at 137pg/ml.
At that time, I was taking 100mg per day of DHEA and he said my high E2 was caused by that.
Strangely, I felt really good at that level. The DHEA seemed to have restored a reasonable degree of erectile capability but it also gave me sensitive nipples. Although that was quite a pleasant feeling, it worried me that I was heading towards gyno so I cut back to 50mg per day and both the erections and the nipple sensitivity stopped. From all that I've read on the subject, that is illogical but that's how it was for me. Nowadays, my E2 is still high (around 50pg/ml) despite 3 x 0.5mg Arimidex per week.