Tamox is a SERM, not an A.I. Read up on it in the forums here. It will block receptor sites. It works different than an inhibitor such as adex. From what I understand it's not good long term, although can have some positive effects on lipids. You need to switch to an A.I. and start with a very low dose. Rule of thumb, 1mg per week for 100mg test. Adex has a 72 hr half life. Go to that forum, you will learn alot. I just started HCG myself and it has made a very positive difference. 200mg test seems high to start out although not unheard of. The norm seems to be around 100mg per week then adjust after bloodwork. Everyone responds differently so it's an individual thing between you and your doc. More is not better. Think long term.
Go to this site http://www.allthingsmale.com/publications.html and read extensively. It's basically the model for what most people do here. He's one of the leading trt docs in the country. Some of the guys on this board have seem him directly. Read it, learn it, live it.
And welcome to the board. Lots of very bright people more than willing to help. I've learned so much here and so will you. Good luck. You should post some bloodwork so it can be evaluated btw.