This patient support community is for discussions relating to Dysautonomia (Autonomic Dysfunction) including: Postural orthostatic tachycardia syndrome (POTS), neurocardiogenic syncope, mitral valve prolapse dysautonomia, pure autonomic failure, autonomic instability and others.
http://hyper.ahajournals.org/cgi/content/full/45/3/385
http://www.tmsforacure.org/mastocytosis.shtml
Not sure if you've already read these, but I thought I'd include them here as well in case you might be interested in any of them:
http://www.anesthesia-analgesia.org/cgi/content/full/104/1/166
http://www.ncbi.nlm.nih.gov/pubmed/15955196?dopt=Abstract
http://bja.oxfordjournals.org/cgi/content/full/97/2/196
Unfortunately, very little has been published on POTS and pregnancy. One of those articles does document Midodrine use during pregnancy, I believe; has that been considered?
Who is managing your dysautonomia? (I.e., a cardiologist, neurologist, family doctor?) Is that doctor at a private practice, local hospital, a major teaching hospital, or a dysautonomia clinic (Cleveland, Mayo, Vanderbilt, etc.)? What was your treatment prior to getting pregnant; were you on different meds then? Have you tried the Florinef only while pregnant or also before this and it didn't help? What dose(s) of Florinef did you try? Were you salt/fluid loading with the Florinef?
Sorry to ask so many questions, just trying to get more information to see if there's anything helpful I can point out.