A similar thing happened to me after my first injection. You should chalk up every difference you feel in the first week to the placebo effect. It takes time for T to do its thing, but your mind is going to be hypersensitive to changes. Don't worry about it.
During my first week I had:
Lots of sweating
Ache in the testes
Very high (too high) energy
All of that wore off as the novelty of injecting wore off. I didn't notice any real, lasting improvements or side effects until at least week 3 or 4.