When does post op pain that disrupts sleep go away? (Lumbar fusion)

I just had lumbar spinal fusion L4-L5–S1 using ALIF at age 56. The first procedure was through my abdomen and second part 2 days later involved putting in metal rods and screws from 2 incisions on the back. This is after 20 years of constant lower back pain that was mostly intense aching pain in lower back, though I had occasional sciatica too. I managed via pain meds and exercises (bike riding and racing, lots of stretching every day) that were very helpful, and various surgeries/epidural shots etc. that were not. Looking back, I don’t think I was fully “managing” the past 2-3 years, as my work capacity in a desk job declined. Finally, my pain hit a higher level with some sciatica mixed in and suddenly I could not work or enjoy the sports that helped me before. That’s when I finally arranged to get fusion surgery. I’m now 11 days post op, and I’m having periods of intense pain in the lower back and buttocks that keep me from sleeping. Last night I slept one hour. Tonight it’s 4:20 am (lol) and I had maybe 3 hours of sleep so far and my buttocks hurt so much.

How long should it take before there episodes come to an end? What can I do now?

At present, I spend most of my days in a recliner chair mixed in with short walks. I also sleep in the chair. I’m taking oxycodone, Tylenol, Lyrica, Celebrex, Cyclobenzaprine, and some meds for constipation. I’ve tried ice on the back which helps a little.

Any insights would be much appreciated!