Upper back pain when driving

I've posted recently about this, but didn't get any reply.

I even changed my car, thinking the seat was just not a right fit for my body, but I have the same issue with my new car: intense upper back pain even on short drives.

I don't have that issue with my computer chair at home.

I don't know what I'm doing wrong. I tried more upright, more reclined, putting the seat upper, lower, nothing seems to work.

I do have scoliosis.

Please help.