MRI, MRA, CAT Scan, EEG, EKG, Nuclear stress test, 2 tilt table tests (inconclusive but indicative of BP changes --- not enough to diagnose neurocardiogenic syncope) sonigrams of various parts of my body and LOTS of blood work, including diabetes, cortisol levels, etc.
Several months later even had angiogram to completely rule out the heart (FINALLY a month ago, BP / Pulse got stabalized ...