I have similar.
Fibromyalgia.
I did attend a pain clinic and that's where s doctor said it's what he suspected.
Once everything else has been looked at as in your case this could be what they will tell you.
There's a barrage of naysayers, experts, personal opinions on fibromyalgia and it's a condition that I find receives mixed reactions.
This doesn't help and my best advice mainly because there is no actual test of proof is to try and self help yourself.
My doctor advised not going down the route of certain meds if I was determined to try and live with it.
I have bowl issues etc and PTSD and I didn't want to add too many meds to the mix within my system.
I think going can gives you a sense of someone to talk to and therefore perhaps help the mental stress of it.
If it's fibro of course.
They don't know enough about it yet.
Having to regulate your life with the energy thing is frustrating as you can be fine doing one thing but pay for it if say you did it again.
Literally no telling.
I think try to not bring sadness onto yourself about it.
Hard to explain but you have my thoughts as it's really sad at times.
Mine began after a brain injury late 40's.
Oh also have you had your b12 folate and ferritin checked.
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