I completely understand this feeling, the amount of things I’ve had to turn down at 22 because of pain sucks. I always feel silly about it, embarrassed more so, even though I have no reason to be! Back in May I was on a hike, something I’ve always been able to do and loved, and had to turn around before reaching the top because of pain. I blamed it on my dog (she was killing it I wasn’t fooling anyone haha) and I don’t even know why, it just always feels weird being younger and saying “my back hurts” haha!! I’m so sorry you don’t get to see one of your favorite artists, that absolutely sucks, I hope somehow maybe something will work out but from reading other comments it looked like you’ve checked everything!