Welcome to the forums! I searched the forums and google and couldn't find anything on anhidrosis after preeclampsia or HELLP. I will ask around to see if any of our other posters have any information for you. It can be really tough to find a link between two extremely uncommon conditions because so few people have either, let alone both. The data sets are just too small to draw any meaningful conclusions.
It is really common to have all sorts of strange symptoms pop up after HELLP. Many of us get tested for a wide variety of underlying conditions (autoimmune, clotting, etc.), and it seems like most of us don't get any answers out of all of that testing. It is frustrating. I am in the middle of another round of testing right now, and I have mixed feelings on finding anything. I would rather just be healthy, but knowing what the heck is wrong with me might mean I can fix some of it.
Daughter born April 2009 at 35 weeks due to Class 1 HELLP