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Sorry to hear of your issues. I've been dealing with lower back pain for 15+ years, seen countless physios, 3 different bike fits, acupuncture, sports massage, MRI's, I've fully unloaded the money gun on it and saw very, very little progress. My pain is sciatica related and I used to get crippling attacks that would leave me immobile for 3-5 days anywhere between 2-6 times a year.
I only got better when I took strength work seriously, I had to go all-in on core strength. Deep core stability muscles, pelvic floor, etc. There are many areas and layers to your core and I only got better when I addressed all of them head-on. IMO stretching feels nice and I'm sure doesn't do any harm, but it sure as shit didn't make me any better.
If you're looking for a magic bullet, the closest thing I've come across is reformer pilates. It's mad expensive but I wish I'd started it many, many years ago.
YMMV of course and I don't know the specifics of your issues and I'm no medical professional. Feel free to DM me.
I have noticed that after a longer ride >2-3hrs I will have quite a stiff lower back the next day. I did have a bike fit earlier this year which has helped somewhat (and I haven't had any proper 'back attacks' since this), but I still feel quite stiff
I have been to a physio (actually an older member of my cycling club) and he believes my hip flexors are too tight from years of desk job + cycling and gave me some specific stretches to do. Again they may have helped a but but haven't 'cured' me.... after 4-5 sessions and paying out of pocket for his advice (albeit at a club discount) i didn't feel like i was actually getting anywhere so left him to it...
A friend of mine who lives in scotland and has his own physio clinic says the science behind the hip flexor theory is shaky at best and has recommend more strength training to build lower back muscle which I probably haven't been doing religiously enough to feel a benefit yet
just wondering if anyone has experienced similar? would really value your thoughts