It all depends on how much you did and for how long.
Ive quit 5 times over the past year for at least a couple months each (1-2), and I damn near had the king of all W/Ds this past time (summer months... 3 full months) I was getting blown off H and chronic...
Im on day 10 now of not doing H.. had a bump in the road with a bottle of codeine syrup and 7 tramadols and 2 suboxone.. but IMO suboxone sucks and doesnt do shit (unless your looking for a tease)
but like i said Im on day ten of no dope, and the major withdrawl symptoms have faded, and its purely mental at this point... just not being able to get it down at school has my ass planted.
after you quit dope for like 4 days and your nose quits running, eyes stop watering, you can feel the addiction "slipping" and subconsciously even realize that your body was indeed dependent on a substance... this is what keeps me sane.
the fact that my own body can realize what hell i put it through that the thought of doing heroin will almost get you too high.
Once you get off, you can enjoy the simpler things in life, such as hydros, small mg percs, on a semi-regular basis as opposed to getting as blown as possible of H every single day, multiple times a day.