We can't tell you whether or not .5mg of Arimidex is enough, only blood work can determine whether .5mg is sufficient to keep your estrogen in range. Get blood work..check estrogen.
You are feeling like you drank Red bulls...could be the increased energy free from high test levels....not sure what to tell you on that one.
Leg hurts from injections...well, you are using Test Prop on first cycle. Generally, Test C or E is the preferred ester on first cycles because it allows the user to inject 1-2 week. You are most likely experiencing PIP..post injection pain. Some Test Props have more pip than Test C or E. You are using Test P on a first cycle, injecting every other day...Lol, i would say it is highly probable your legs are going to be a little sore.