I am no doctor and I only respond from my own experiences. I could be wrong even from that so my best advice is to talk to a doctor or pharmacist about you question. My situation may be different from yours. I am an addict, I was abusing opiates for many years. If you were taking them for legitimate pain and taking them as prescribed, you may have different results or experiences. You may have different results just because you are a different person. Anyway, here is my answer to your question based on my own experience with withdrawal:
On day four of withdrawal, you may start to feel better, but your body is still in it's process of withdrawing from the medication. Not sure how long, but it takes a while for this process. By taking an opiate
after abstinence for 3-4 days, it's like going backwards. You are prolonging the withdrawal, and you are likely to experience that "acute" stage of withdrawal again if you stop taking it even after one dose. I do not think it will be as bad as day one, however, and I don't think it will be as long. I know when I withdrawal, I either wean down or stop altogether. If I were to take something after day 4 of nothing, I would experience acute withdrwal again when that one dose started to wear off. Like I said, this may be different for somebody who was not abusing their medication. My OPINION is that after four years of use, abuse or not, you would likely experience more withdrawals.
You have a legitimate pain problem which needs some pain management. If I were you, I would either quit altogether until you see your doctor, or stay on the medication until you and your doctor discuss other options. If you really think you want to go the non-narcotic way to handle your pain, I would stay off the medication, you've come this far!!! There are other options out there. I have back problems and I have found much relief from exercise and
Celebrex. I also do back strengthening techniques I learned in physical therapy. I do not know exactly what is wrong with your back, and you just may need opiate therapy. If you do, it will be life-long and tolerance is a *************************! If you need it and don't abuse it, do not feel ashamed. I hope all goes well for you and please respond with how you are doing and how your doctor appointment goes. I am praying for you! Good Luck!
Also, if anybody else differs in opinion, please respond! I do not claim to have all the answers.