I'm 17 years old, have a lot of lower back pain and have a right curve in my upper spine. Have an appt in october, but what is the likely treatment?

It depends. It depends on the severity of the curvature whether meds and bracing or surgery is the best approach. .
Scoliosis. Teenage girl w. "curve in upper spine" should first see an Osteopath & request that curvature be examined both standing & lying. If curvature resolves lying prone, this should be documented by X-ray lying prone; to prove that this is a functional, & not organic, scoliosis. Not uncommonly, persons with "benign" Joint Hypermobity Syndrome have scoliosis only when upright, & this is not surgical. .