Hi tinko :-)
I do not personally know any MD in Chicago, but this is a link in our Health Pages of specialists in dysautonomia.
If you click on DINET you will find many in Chicago. I spotted one in North Chicago :-)
Two Drs I know of our Dr Marc Ovadia who has offices in various places in the Chicago area and Dr Scott Miller at Advocate LGH in parkridge. Both are excellent Drs. Both are EP Cardilogist with incredible knowlege and both treat adults and Dysautonomia.