Physiotherapy/physical therapy is worth a go but may take months and is no sure solution. Even if you’ve already seen a physical therapist its worth trying with another practitioner because the skills, experience and treatment approaches can vary even among specialists.
Short of this surgery seems like your only option. Can’t speak from personal experience but people I know have had success, experiencing relief from their symptoms. Surgery may seem a bit extreme but it is rather common and low risk and for the benefit of relieving symptoms and just overall better quality of life for years to come it’s worth it.
Your healthcare practitioner or surgeon is a great source of information on the topic and will probably gladly answer any questions you have. Online much information on procedures can be found