Hello. My wife and her mother both have cfs so I do know a bit about it. They are both NT, though. They both contracted Lyme Disease about the same time when they lived on a farm. The cfs started in when my wife was in junior high. I guess it can often be triggered by heavy illness. I don't know about a connection to AS, but I know that AS traits can become more pronounced during periods of struggle and cfs is all struggle, both physically and cognitively.
It has taken my wife up to an hour to crawl from the bed to the bathroom, and she often experiences confusion. She used to be part of a support network, so if you have questions you can PM me and I will ask her. So sorry to hear of your suffering.