If your sensitive E2 is really at 65, and it could be, then that would explain how you are feeling but I don't think one large injection is going to help you. Do you know what your SHBG is? That is important to know to establish a proper injection protocol. If your SHBG is low and you take one large injection you are going to have lots of Free Estradiol floating around and could make things worse because your E2 will spike upward. If you have high SHBG then one large injection could help you. If you stay on the injections like you have now I would not take .25 mg of Arimidex on each injection. That's quite a bit for a week. You might be fine doing that but going fro high E2 to crashing it is just going from one frying pan to another. You could take one .25 mg Arimidex on our first injection of the week and then hold off and not take another .25 mg Arimidex unless you feel like you must.
I'd like to see others more qualified than I offer some additional advice.