To pregabalin most probably not, when you manage a week without it you won't be that addicted to it BUT opioids are a different beast, as I didn't stand the full withdrawal and was using memantine to get over it I can't tell for sure but I would be say yes. Specially when you remain to have loose stool. As a short time aid you might use loperamide yet that will also prolong because it's an actual opioid, just one which doesn't cross the blood brain barrier.
You might give Kratom a try, it's the only opioid I am still using and the only symptom I get from not using it is diarrhea which would be treatable by loperamide. It sucks but probably not the worst option.