I agree that lots of problems don't surface until after the HG is long gone. My sister (who had 3x HG) found the same thing, with gut and kidney issues still affecting her years after her last HG pregnancy.
The hard part about health issues like Cushings is that it's an autoimmunal issue, so if your body is not having a 'flare up', the test results can be confusing. That's so frustrating! I hope they are able to pinpoint exactly what is going on in your system so that you can get some relief. It's hard going so long with so many problems and no proper treatment based on a sound 'diagnosis'. We've been going through many exploratory tests with several specialists (pediatricians, endocronologists, GI doc's, respirologists) over the last year with my daughter at the Children's hospital (for different reasons), and all the testing, frustration over wasted time, and the "not knowing" is really straining after a while.
The good thing is you are finally working with doc's that are showing odd results. Although this is frustrating, sometimes odd results prompt them to take things more seriously to help you discover what is really going on. Hopefully you get some answers soon!
DD1 born Jan 29, 2010. Mod-Severe HG. Started treatment at 5 weeks. c-section (breech)
DD2 born July 23, 2012. Severe HG started treatment at 4 weeks until birth. VBAC!