Sky, what do you think happened at the lesson to cause that back pain? That sounds awful! The only time I get really bad back pain IS when we do a lot of canter, and transitions, because I tend to over cue with my leg behind the girth...instead of BARELY letting my leg touch her right behind the girth it's as if I'm tightening and almost twisting my HIPS to apply the cue!
You're the first I've read who MAY be doing the same? Again, usually with many upward and downward transitions, walk to canter, canter to walk..TIGHT BACK!! A r g h h!
Hope you're feeling better!! :0(
I'll give you all an update when it comes to my first lesson at the new barn. Fingers crossed it's a good match...