@Bejeeber, I am just learning about EDS myself. I needed 2 hip replacements in my early 40s, have hypermobile elbows, and also have an aortic aneurysm, which indicates the vascular form of EDS. I never considered that it could be connected to Clusters. It is an indication that your body does not properly synthesize collagen and, as you said, can take on many forms.
I also came across this in my research regarding the connection between cluster and mast cell activation. https://journals.sagepub.com/doi/abs/10.1046/j.1468-2982.1990.1005221.x?fbclid=IwAR3ohiL8nyoetehD3hUBeXm42XcpvOsS2VHhODpxDHeOK3jjJC8VVqwpkQM