Snopes is wrong on this. Go to youtube or Google video and search for a documentary called Sweet Misery. It follows a woman who's just been diagnosed with MS as she investigates the aspertame connection. She interviews doctors, patients, researches, shows documents, etc. that make a very strong case. And I can say from personal experience that cutting aspertame from my own diet reduced my own FMS symptoms down to a very managable level, especially when it comes to the neurological symptoms - the weird pain in my eyes, the facial numbness, etc. have gone away. I can't say that aspartame caused my FMS but it definitely wasn't helping.
Well, how about: The Food and Drug Administration? The medical publication Lancet? The American Council on Science and Health? The Massachusetts Institute of Technology? And Time magazine? All of these are wrong but you and some YouTube video is right. The only thing Aspertame does is give you gas. If you want to believe that your gas problem is something called FMS (which is probably misspelled and should have been PMS)
I have heard both what the OP posted and have heard of the documentary Sweet Misery. On that note, I don't believe everything I read, but I have been trying to "cut back" on my aspartame intake just in case this IS true.