Why did you start arimidex in the first place? Your estrogens are very low and this can cause all kinds of health problems for you in future.
AIs such as arimidex can by themselves cause suppressed libido even if your E2 levels look good on paper. You can only measure serum E2, which gives only an average that may look good because, for example, your fat tissue may be producing lots of E2 even while the AI may be suppressing E2 too much in your brain (leading to low libido) and bones.
I was on TRT for a couple of years with “optimal” E2 using arimidex. My libido was terrible. Currently I am on 100 mg T per week without an AI and my libido is good even though my ultrasensitive E2 is quite high, close to the top of the range at 24 (range < 29).
Many guys on TRT do not need arimidex at all. If I were you, I would stop arimidex completely for about six weeks and see if you feel better. Unless you are very low (as you are) or very high, tests are not very helpful, since there is no optimal E2 (according to Drs. Crisler and Mariano) since everybody functions best at different levels, so how you feel is more important than what the tests say.
I had an e2 level of 51 a couple months after starting 120mg test cyp/ week
i then was prescribed .5mg eod
e2 went to less than 1
i cut e2 down to .5 e4d
e2 went to about 5
last adjustment was .25 e3d which yielded latest results
I can’t recall for sure but when I tested at 51 it may have been the morning after a weekend of heavy drinking, so I don’t know how much of an impact that had on the test