1mg anastrozole per week for every 100mg T per week seems to hold for doses we see with TRT guys.
You are taking enough anastrozole to manage 100mg T per week.
That is the problem.
When TRT guys get dry hCG and reconstitute and refrigerate, we see 10,000iu vials lasting 80 days at 250iu SC EOD with no problems.
The expiry dates are not based on knowledge that the product degrades. In any case, the date indicated that the advertised potency is there at 30 days.
"anyway i've been running arimidex 0.25mg eod since my first injection, i definitely have felt that its been working because my joints have felt a little sore.. so basically i'm just looking for some advice. "
So you stating that your E2 may be high enough to cause gyno but may also be in the single digits [<10pg/ml] because your joints ache.
That is conflicting information. So you can take more anastrozole and see what happens.
You should have been more knowledgeable about these issues before you started.
What are you going to do for PCT? Understand and have items on hand.
Take 20mg Nolvadex per day and note how tissues respond. EOD may also be adequate. Again we have conflicting E2 evidence.
Read this and see if that helps: http://tnation.T-Nation.com/free_online_forum/sports_training_performance_bodybuilding_gear/the_pct_serm_dosing_in_this_forum_is_wrong
There are other things in this forum that you should read.