Thanks for the response! I was seen by a Cardiologist on Friday 11/17/17 and he took all my information and gave me a diagnosis of POTS. He also referred me to the Autonomic Clinic and scheduled multiple tests (Cardiac Tilt Table, Hemodynamic testing, and an Echo). I was also prescribed a low-dose Beta Blocker. It's been such a long haul and my symptoms have gotten significantly worse over the past month. I'm so glad I took video of what happens with my heart rate so I could show the doctor. I've had an awful time with doctors that I'm almost conditioned to expect the worst, so it was fantastic to finally feel like I was/am being taken seriously! Obviously the diagnosis causes a conflict of good and bad reactions in me; I am so glad to finally feel understood and validated in the situation, and at the same time I am scared as **** about what my future holds. The uncertainty about whether it will continue to progress, even out or improve leaves me unsure of how to cope with the stress. To think I was doing really well during the summer of 2016 (I was running, working out 4 to 5 times per week, visiting friends in different states, able to work hard at my job...) and now in Fall/Winter 2017 I feel like I am a totally different person in almost every way (Can't think straight most of the time, pre-syncope multiple times each day, dizziness is constant, headaches, abdominal pain, constipation/diarrhea, food intolerance, can't sleep well ever, Brain fog, muscle twitches/spasms, cold hands and feet, tingling/numbing/odd sensations in my extremities, difficulty even standing for more than 10 or 15 minutes, and missing so much work that I am worried I will be unable to work in the foreseeable future...). Sorry to ramble on and on, this experience is just awful. I have been researching POTS and saw that the constant fluctuations in heart rate upon standing and sitting/lying down can cause spikes in Norepinephrine, which causes increased anxiety and a state of general hyper-arousal. That information helps me a lot as I have been agitated and have had a general feeling of dread which has increased exponentially over the past couple of months. I don't know how I'm going to get through this, but I will keep trying to plug along.