Yo. Absolutely not fun when you're halfway through a set and you realize you can't stand anymore. I feel your pain... literally!


Mine boiled down to a really fancy version of "it's all in your head." I mean, it's not, but it is.
MRI showed nothing. Epidural did nothing. XRay showed nothing. I would be given PT exercises that would help for a bit, until they didn't. Chiropractic adjustments and massages and tens machines and theraguns offered momentary relief but didn't fix it. A whole lot of Physical Therapists/Physios in NYC and Scotland looked at me and not only couldn't find what was wrong, were dumbfounded by how flexible and in shape i was. But it hurt.
Turns out for some unknown reason, either my hip was sending errant warning messages, or my brain was overreacting to the warning messages and causing pain. It's similar to putting your hand near a fire. It's hot and hurts as a warning before it actually burns you. My nerves or brain was misinterpreting me standing in a certain way as dangerous and told me it hurt to get me to stop doing it. I finally found a PT who knew what was what and since i saw him i've gotten it pretty much in check. Not healed. But i can prevent it from happening 90% of the time. PT said often it starts when you injure yourself a certain way and then get better, but your nervous system is extra cautious, but really could be anything, and you just have to retrain your nerves & brain not to overreact to the stimulus and it'll realize "Hey, standing is fine. It's just standing. I'm not getting damaged."
So i joke it's a fancy version of "all in your head." Or a more complicated "It hurts when i do this. Don't do that." I found the standing posture that causes the pain, and now i stand differently.
The PT also gave me the only exercise that has consistently helped: Heels no more than 1.5" away from the wall. Try to touch the wall with the small of my back so you can't slide a hand between it and the wall, while simultaneously getting my shoulders against the wall, while simultaneously getting my head against the wall & tucked chin & stretched neck. 90+ seconds a couple of times a day, every day for a few months and i couldn't believe the results. Now it's at the point where i just do it when i feel like it's been acting up, or if i've been on my feet too long.
And to bring this back to the OP, it's too easy for a heavy bass strapped over one shoulder for too long to put me in the wrong posture, especially in a gig with a tiny stage where i can't move around and i'm just standing there in one spot for 60+ minutes, exactly like how it all started trying to wash the dishes, except now there's a 12lb bass too. It ain't worth it. Don't care how good the bass sounds or how tough people who like heavy basses think they are. I'm gonna ask how heavy a bass is before i buy it.