Hello Jennifer,
Sorry to read about your back pain. And your being in the performing arts makes it doubly difficult I'm sure.
I too have back pain, and for me wood chairs are an absolute NO NO. I use a formed cushion which helps me some.
I'm glad you have had x-rays taken. That is a first step.
Jennifer, I would highly recommend that you seek the advice of a neurologist/spinal surgeon. They are the most knowledgeable about back issues. You really do need to get their advice before things get much worse as I'm concerned that to wait will lessen the chances that you can continue with your love of the performing arts.
Do seek out the best neurologist/spinal surgeon that you can find in your area. Talk to people and find out which spinal specialist (and that is with an MD after their name) they have high regard for, and which ones they do not like. If you have a professional sports team in your area call up their office and find out which spinal surgeon they use for their players. Call up your local hospital and ask the person which spinal doctor they would go to if they had back problems.
Then call the doctot who is the highest on your list and make an appointment. Next, call the doctor who is No. 2 on your list and make an appointment with that doctor. It is always good to get a second opinion.
Jennifer, please see a neurologist/spinal surgeon without delay. I'm very concerned that perhaps all your movements in the performing arts may be making things worse.
Your body is trying to tell you that something is not right. Listen to what your body is telling you. AND remember, your body comes first, so don't delay.
I hope all goes well for you. Please do let us know how things go for you.
Take care.
RichT