This is just my humble opinion. I can not diagnose but I do have a clinical background which gives me a unique understanding in how the mind and body influences each other. ADHD as well as other mental health conditions and fibromyalgia operate
on a sensitization scale (this means your body shares the same pathway as your mind and generally responds to or falsely responds (often amplified to stimuli.) This explains why there can be over 200 different symptoms of fibromyalgia). It doesn't mean that you will get everything and why some people go into remission. A typical person who is not affected by mental health issues usually has more leeway to process stimuli. If you have any type of peculiararities you are many times more likely to experience different symptoms of fibromyalgia. This also explains why flares generally effect a person cognitively as well as physically. I'm sorry if I am not explaining things more simplistically. I am a person coming out of permanent fibromyalgia fog but the clinical trained background I rec'd several decades ago has resurfaced. The good news is everything is not gone and you can find the tools that work best for you to improve. Hope this helps if you need more clarification search your symptoms and how fibromyalgia effects them. I wish everyone well. I was in fog for years, I've been there, I've lived it. I know how difficult it can be.🌿☯️