I suggest going back here:
https://www.tmswiki.org/forum/threads/day-1.28922/ (Day 1)
That was just 6 weeks ago or so, and you describe researching the mind-body syndrome for close to 2 years. With that in mind, give yourself a break--you've done lot of work and reflection--you may even be right at the edge of letting go of these current symptoms.
Look back on the discoveries you made when you were working on the SEP. What parts of that really made sense for you? What practices nailed it for you personally?
There are also many good suggestions above, including the very clear way
@JanAtheCPA describes 'reflective journaling'.
Also, trying to identify what
exactly is causing the pain is obviously frustrating b/c you can't get there. But, that frustration over not being able to figure it out--and that it's ridiculous that the pain is even there because life is good right now--might be perpetuating the symptoms.
What if it's not really what is going on on this normal day that is driving your symptoms? What if it's something buried or repressed or difficult to accept--and that there's been a cup filling up within you, and that cup was just over-filled? Or, something today reminded you about something you weren't even consciously thinking about? Some folks even struggle when things are going really good (for various reasons--it's too good; there's guilt there; crazy perfectionism where it was to be not just really good, but perfect.)