Id first like to say, joining this forum is my first decision in improving my current quality of life......Now, has anyone had experience in the withdrawal that comes with the use of hydrocodone? How long does the" flu" last? My treatment is ongoing, but as a full time student, I need more control. I've been in the bed for a month. Suffering from pain from endodemetriosis, polycystic ovaries, and migraines.