Dweeb, the Mirena coil is slightly different to having progesterone inthe pill, jab or implant. The Mirena coil does release progesterone locally, ie into the womb, but it is at a low dose, and should not get into the blood stream. The pill, jab and implant all rely on progesterone being carried around the body in the bloodstream, allowing the progesterone to prevent ovulation. With the Mirena coil, it works the same way as any other coil, but has the added local progesterone release. For me this has been brilliant, with no periods for the last 13 1/2 years (I am on my 3rd Mirena), and no apparent affect on my HMS/EDS-H. I know that not everone has been this lucky, but worth considering or trying, if progesterone is needed.
Diagnosed HEDS December 1st 2005. DD1 (20) HEDS and scoliosis (now corrected by surgery), diagnosed June 2006. DD2 (18) mild HMS. Son (11) some hypermobile joints, poor muscle strength and seems to be developing scoliosis as well, woopee!