It's my personality to do everything for everyone - I've been like this my whole life.
I just want to reassure you, which may help with the panic a bit, your story sounds almost identical to mine and I am about 98% better now after being here and doing the structured education for ~6 weeks. Do the Structured Education Program. It really, really works.
My onset was sudden as well. It happened when my brother died and I was convinced that I had a huge bone spur AND MS AND a compressed disc. My doctor did an X-Ray and saw nothing. She did blood tests. Nothing. She sent me to PT where he did a little test on my neck by pressing my head sideways and said that if I had a herniated disc, my arms would have gone numb. They didn't.
I was absolutely sick with panic and fear. I couldn't think about anything else and this had been going on for 8 months. I know exactly how you feel. I thought I would never make pottery (my profession) again, or ride my bike, or do yoga. I'm doing all of them happily and without any pain now.
Get Alan Gordon's The Way Out and listen to his podcast Tell Me About Your Pain. Dr. Sarno is the OG, but it sounds like you've been caring for everyone but yourself, so you might need someone to give you permission to take care of yourself. He's amazing at that and he'll tell you why everything feels like it does. It's very research-based.
Also, try a couple of these >10 minute guided meditations from Dr. Bob Evans:
https://painrehabsource.com/podcasts/ (Pain Rehab Podcasts – PainRehabSource)
You have nothing to lose right now. Start with #1: Noticing the Body and Breath
I'll do one with you right now. I know this feels so bad and you're so scared, and my heart aches for you. Listen to
@Cactusflower. She's an OG and got me through my most fearful moments, along with a bunch of other folks here.