Sourcing drugs isn't allowed on Bluelight. Kratom and loperamide (legal in the states) both have mu-opioid action and can help with withdrawal, and some states sell codeine OTC though you'd have to call up your local pharmacy and ask or find the info online if WI does or not.
There are several threads in the OD Directory on dealing with opioid withdrawal.
either ask people on the street or don't run out early.
next time tell your doctor you are abusing your meds or something. take some loperamide. might help you out.
either be prepared next time or have a back up plan.