Manipulation . An osteopath can manipulate the tissue/joints to help with sciatica. You may also be taught done stretches that will help.
Depends. It depends. They would need to do an exam and find what needs to be done and then talk to you about the treatment options.
Osteopathic Eval. Some osteopathic physicians do manipulation to see if a vertebrae is dislocated and he/she can offer treatment by trying to correct the pathology. If this does not help, it could be pathology in your spine that needs to be further evaluation. Recommend seeing a pain/spine specialist.