You may not experience any withdrawal. Most of the time people don't unless they had previous opiate dependence. It takes a while for the brain chemistry to change to where one gets sick.
If you do experience wd,then it will be as others said--mild. Runny nose, sneezing fits, hard time sleeping, restless, possible diarrhea.
As someone mentioned, Imodium takes away most symptoms of wd. You need more than directed, but not insane amount (maybe like 12 mg) don't worry about it constipating you--when in wd with diarrhea it absolutely won't
Mostly your biggest symptom is going to be mental--getting through the craving and desire to use. Your brain will try all sorts of ways to get you to put that feel-good chemical back in your system. You may even have dreams about using. If you have cravings just don't feed them. Remember that a craving is just that--a quick albeit intense thought. Distract yourself; don't sit there reminiscing. Cravings only get power when we feed them
Good job on stopping now. It gets much harder down the road