As iron said it is rather unusual to get the symptoms you describe this early in a long ester cycle. A short ester cycle could be different but really still it’s early. What all that boils down to is you are sensitive to the changes that these shots caused. It could and probably will lower as you progress (the ultra sensitive part but I am not a doctor).
I noticed you didn’t state stats and it’s just a sad shitty fact that body fat will cause you to aromatize test at a higher rate vs the skinny guy. You did say you had puberty gyno issues so chances are even if you are a skinny guy you are just sensitive. I always say there are guys that start having estrogen issues just looking at a bottle of test, sadly you might be in that boat.
How to handle it, I am not sure if you took a second dose of arimidex. I would suggest 0.5 mgs on injection days. You have to remember that it takes a day or so for the dose to start working, then it takes a day or two for the estrogen levels to lower, then it takes a few days for some of the signs to subside. So don’t go all crazy and just start taking 1mg three times a day. I think the added Nolvadex is a good idea until you have the arimidex dose working. Basically keep doing what your doing 0.5 mgs of arimidex on injection days and either 5 or 10mgs of Nolvadex EOD should do it. Do that for about a week then stop the Nolvadex. Nolvadex has something like a three day half life I i recall correctly so once you stop you need to wait about a week to see if just the arimidex is enough. Since this is early in your AAS usage I would think as long as you don’t show signs of low estrogen then it’s okay to stay at the 0.5 mg and use the Nolvadex also if the arimidex doesn’t seem to do it alone. Now down the road you will need to figure out your arimidex dosage. It’s also possible that you might respond better to aromasin. I would try those two before you try femara and all that is something to worry about later. Ideally you would figure out your needed arimidex dose but you are early in this and that might be a bit much to handle especially if 0.5 mgs plus a little Nolvadex does what you need.
If you want some home remedy to try and help with the possible prolactin, try 600mgs of B6 daily. It helps handle progesterone and prolactin comes with progesterone. It seems to help a bit but it’s not the same as prami or caber.
If your HCG is the reason for this, and it actually makes you aromatize test in your balls then no amount of arimidex will stop it. That estrogen has to be managed with Nolvadex or another SERM. The first time I added in HcG I definitely had nipple/gyno issues. Nolvadex took care it and I was fine. I don’t even seem to remember keeping the Nolvadex in the mix until the end, I think I just used it for a few weeks then stopped and everything was ok. Pretty sure it was 10 mgs EOD, I was worried that I would build a tolerance to Nolvadex and my PCT would have issues.