I have used estrogen and at one point testosterone. irregardless of which you choose, the period in which you come up is known as a "bounce back" period because your natural hormones are still suppressed for a period of time before your pituitary recognizes the shortage and starts its natural production. I dont know if you plan on going on estrogen again but if you simply want to restore your natural test levels again, you can use fertility meds to aid in a faster recover. Clomiphene citrate is a common one, as well as HCG.