Honestly I'm not sure what type of responses are being sought on this topic (opinion, discussion, debate, etc) but I've read this entire thread and wanted to share my experience...
After my most intense and longest lasting depressive episode that lasted over a year, I suffered excrutiating pain in my spine. It was completely random and in my case, worse than the 15 hrs of child labour I endured.
I didn't hurt myself, and knew enough about my anatomy to know all muscles were intact and completely fine.
That first bout of spinal cracking horror lasted 3 weeks, I was unable to move for the first 10 days without crying, needed help getting dressed and going to the bathroom. Every movement resulted in feeling like my spine would snap at any moment, there was such an immense amount of pressure it honestly felt like it was cracking.
3 weeks of constant relentless pain, pills didn't help, dr's thought I was nuts or I had hurt myself but didnt know. Yeah right!
Anywhoo, to cut a long story short, its been well over a year now and my spine still cracks, always in the same spot, albeit not as badly as that very first time. The most days I spend crippled with pain now is 3. Dr's still have no answers, one basically said "never heard of it, impossible!" and dismissed me.
What I have noticed though, is that my "Spinal cracking horror" (My official dx don't laugh!

) is directly linked to stress of different types. Basically the bp episodes or bpd *****fits are either present simultaneously with the pain, or followed by the very bad bouts of pain. Normal life, job stress triggers result in managable pain.
I am now very mindful of stressors these last few months, and I believe that this has caused the flares to subside in intensity.
I looked up psychosomatic disorders, but apart from me magically attending therapy (no money, no job, govt T full) and being confirmed as such, I'm going with "Spinal cracking horror"