Just started fentanyl 12 much yesterday morning.The Pharmacist told me that I may experience more pain to start with and he was right.A lot of pain last night and today.The dose will go up every 3rd day. My question is this is a pain killer, why even if it is a low dose that I should hurt more. Very bad lower back due to herniated disc sitting on L4 nerve, facet arthritis,Osteoarthritis.Degeneration disc desease,Stenosis of the whole cervical spine Fibromyalgia,Meds Neurontin- Nortriptallyn, Tylenol for arthritis,zopiclone for sleep.Highly sensitive to loads of meds