HCG is not meant for pct. It's an 'on cycle' drug.
To be honest, I dont think 16 weeks is appropriate for 'cycling'. If youre going to be on for that amount of time, blasting and cruising is probably a better idea.
But that advice is only good for the future, at this point you should read threads on various board about people trying to recover from long cycles.
4-5 weeks of a SERM or two could work. Nothing is guaranteed across the board, too many variables.