@spike1 My surgery was a thoracotomy with lower right lobe removal in April 2020. My upper back pain started in the hospital. I found I could not lie down even in the hospital bed and slept in the chair at the hospital or I would wake up in horrible pain. At home I found sleeping in a recliner after surgery where I was not laying flat helped. Once I started sleeping in bed I used some large pillows to sleep at a 45 degree angle. I actually still sleep that way. I have found laying flat to sleep causes me to wake up with upper back pain. I take gabapentin and am scheduled to see a pain doctor at Mayo to see if anything else can help. I hope your pain soon goes away or you find the right medication to manage it.
Take care,
Juliette