Mine is lumbar scoliosis & it sounds like yours is, too. I also had intense buttock pain, especially on the left. I worked with a physical therapist for several weeks, who gave me a graduated program of core strengthening & balance work. This didn't *eliminate* the pain, but alleviated it greatly in both low back & buttocks.
He also said it's important to avoid exercises that could/would make it worse, which include twisting, bending and twisting at the same time, sit-ups of any sort, rowing machines, and any heavy lifting at all. If bending is necessary, "hinge" bend at the hips, never the back.
Now I only need occasional ibuprofen & acetaminophen together, and a rare 50-mg tramadol. The right exercises can help a LOT.
Another thing that helps me is dead hanging from a doorway pullup bar. It's instant traction and may hurt a bit at first, but then is very helpful. My physical therapist said if it helps, it's fine to do.
Scoliosis is no fun & doesn't go away, but there are ways to make it tolerable. I wish you much luck and improvement of symptoms.