See this is why I'm confused also, I was DX with fibro almost 10 years ago. I have never had joint pain and any muscle pain seam to just come from over doing it. Just this past week my thigh muscles would hurt but than they would go numb. I do have nerve type pain (including electric shocks) a lot, my last Dr DX with with neuropathy but my new neuro tested me for that and said I did not have neuropathy but he didn't know why I would have nerve pain.

I have a lot of weakness. When I do try to do much I get weaker, shaky and dizzy. My arms and legs feel like weights and there very hard to left up. I have even checked my sugar level when this hits, it's always been fine.

I get very confused/lost feeling a lot and I feel like my body is shutting down. It's scary feeling sometimes.

I also "black out" some times. I will be walking and my ears will start ringing (I know to stop and grab on to a wall or something) and than my eye sight goes black, I can't tell if I'm still standing or not. I'm not able to hear well, I seam to be able to say "just a minute", right as it's starting. DH is very use to this now and he knows what it looks like when it starts and will grab my arm to make sure I don't fall. This whole thing only last about a minute maybe two, I've never been about to time it but DH has said it what only about a minute or so. I have checked my sugar level right after one of these and it's always good.
Can't say for sure how many times this happens but I can't remember a whole month going by with out having a less one of these and it's been going on at least 20 years, at 1st I only got a few a year. My mom didn't ever take me to a Dr over it because she said it was just low blood sugar, I thought she was right until I got older and was having them more often and it didn't feel like my blood sugar was low and I got a glucose meter to check it.
My last Dr didn't know what it was but sent me for an MRI (4 years ago), that came back clear.
My MRI from last month came back clear also.