Hi Amby I was diagnosed with POTS just this last fall. However it took about 2 years to finally get diagnosed. I have had a total of 4 tilt tests. My very first test I passed out within minutes of being tilted. It seemed like every test was different. For some tests I was suppose to take my meds, and others they told me not to. It seems like different doctors interpret the findings differently. I was getting to the point that if I had to take another tilt table test, I was going to record all the data myself and refuse to take anymore. The best overall testing was finally done in September. My doctor for this test confirmed the POTS diagnosis, and even appologized for all the other doctors that I had seen. My other doctors had misinterpretted the data, because they were lacking the understanding of POTS..... Long story short, stick to your gut feelings. I was told my problems were "all in my head", and I knew that those doctors were wrong. Luckily I stuck with it. It gets really hard, and it is easy to loose faith in the medical professionals. Howver, not every doctor is clueless. Good Luck and keep your chin up!!