Yes, this is a constant for me now. I got one of those chair pads for a broken tailbone or sciatic. I use it on my car seat now when I drive or am a passenger. I does help some.

This happens to me as well. Also happens with a change in my bed. Ibuprofen usually helps with this for me.

I had a heated vibrating seat cushion( it is one that covers back as Well as buttocks)
that I put in my car when driving long distance . I found that good. Last couple of times I didn't have it because it broke and I suffered. I really have to get new one

You may have osteoarthritis. I've found that I hurt more with it than fibro. Prednisone helps with inflammation.

I use a TENs machine for long journeys, this has really helped me,with out it I just would not be able to go. Also use it for cinema has helped to give me back some of my social life.