hCG will cause estrogen rebound, this is where the emotional roller coaster comes from.
This is mostly because your testies are producing test and your not ready for it, it gets converted into estrogen and wasted.
IMO hCG is a waste of time, run nolvadex 20mg ed for 3 weeks, 10mg ed for 2 weeks. Run your arimidex out to the third week (this is 5 weeks after your last shot) and you should be ok.