Theories?

Anyone have any theories this is connected to Covid-19 and other variants of it?? What's interesting to me is how busy this reddit is, what doctors told me is a "rare condition" seems not to be, I've heard of someone else I know also going through this. It seems like this is becoming more and more common, and I'm wondering if its related to long term complications from getting the virus?? Better yet, anyone that's an actual scientist, doing more research on this disease???