Yeah I have flair ups if I'm cold or overdo it, even walking to the shops, some people still don't believe its a real thing, yep my doctor wanted me to do light exercise but I can't, it hurts, just like you said
Mine took 6 years to diagnose, but had it before then just not as bad I was going back and forth with back pain, physiotherapy as they thought it was muscles in my back, then it moved to my neck and shoulders, and shoulder blades, my anxiety got the blame for that, I was told I'm tencing up because I'm anxous, so my neck and shoulders are stiff, then it wasn't untill my whole body felt like it was crushing itself I looked it up and had every symptom told a nurse she done pressure point test, then looked at my pain history and said yeah fibromyalgia fits but we can't prescribe what you want, even though I said it helped when you was giving me it got my bad back etc!
Sorry you have it too, and your mum, shit I hope my son don't get it, is is passed to boys like you say it does girls, men get but but not as many as woman, my son is 19 thinking back too when I was that age my back was weak, I couldn't sit for long I'd lounge propped on cushions, but no pain, tbh I think that was the start
And yeah it's just getting worse and today I've said I'll go see my mate, I don't want to but don't want to let her down as she'll be mad at me and I tried making an excuse the other day that I forgot my other friend I hardly see is coming today, but she guilt tripped me and I then said okay I'll rearrange him, and see you Sunday, she knows I have anxiety especially around people I don't know, I hardly see friends, lost loads as can't go raving anymore, and my mate is having 11 people at hers, I'm freaking out already as I have social anxiety too
Sorry for the essay, just nice talking to someone who understands, sending gentle hugs back