I inject 150mg every 7 days. I seem be very tired for the first couple of days following the injection to the point of having trouble staying awake at work. This tiredness seems to disappear as I get closer to my next injection. Could this be due to a rise in my E2 levels immediately following the injection which would cause me to be tired? Then as my E2 levels drop it causes tiredness to fade? I currently do not use AI.