Dear Members, I've spent the last several days looking over as many posts as I can to learn more about dysautonomia. I have been struggling with a "mystery" illness for over 8 months. It all started when I took a 10mg. pill of the generic version of Ritalin. I went into what I would describe as the worst panic attack I had ever had and I have only had like 1 or 2 my whole life! The doctor said it was simply a panic attack. That was at 10am so when it kept happening all day and wasnt better by 7pm we decided to go to the ER. Again, I got the it's a panic attack. I kept telling them that I have never had a panic attack that lasted ALL day and I was sure the Ritalin did something to me. The assured me it had worn off as it only last 4 hours. That was the beginning of what I would describe as my own personal ****! My heart did not slow down, it just raced and raced. I felt like I was going to pass out everytime I stood up. I could not get my body to "settle down" for some reason. The doc tried a beta blocker and little did I know it was going to lower my BP so I almost passed out in my laundry room as I have low BP to start with! My BP has not been high during this. When my HR is high it's actually pretty low. Then we tried some "calm you downers" and I felt HORRIBLE! I just did not know what to do! Then I started noticing it happening (high HR, shaking, dizzy) shortly after I would eat. Then in about 30 mins. I would be in the bathroom and you know the rest! This is the craziest thing I have ever been through! I am being tested for the pheochromocytoma but I think I have a dysfunction of the nervous system brought on by the Ritalin....in your opinions, can this actually happen? I've seen a endo and I beleive she did the test to see if my heart rate increased when I stood up from lying down. I told her that was in the beginning of all this but not so much anymore. She took me off Armour Thyroid (it had T3 in it) and switched me to the other type. It helped a tiny bit but it was still there! I know this is alot of info but I need some input from people who are actually living this...not many people understand what I am going through! I do not think this is anxiety as I feel good in my mind if that makes sense! I also recently developed acid reflux and hiatal hernia! Here is a little more of my info: Things that help: Powerade (Now I know why after reading your guys' posts!) Getting enough sleep Eating small meals with a balance of protein/carbs Digestive enzymes Probiotics Things I've Tried But Dont Help Or Make Worse: Trazadone Buspar Ativan Acupuncture ( I call it accutorture as it gave me 2 or 3 days of episodes) amino acid therapy (naturpathic doc did not understand this at all! I told him it was the tyrosine!) Various other herbal remedies that are supposed to be "calming" Bending over is the WORST! I get so dizzy and my heart starts to pound. I'm probably leaving out a ton of other stuff but I dont want to bore you all as you know what it's like! Any info/thoughts/suggestions would be great! I am feeling better than I did when it first happened but I am no where near what I was before so that is why I wonder if you can have this from a drug reaction. I have always been sensitive to certain medications and have had bouts of insomnia for years...I wonder if it was just lurking waiting to come all out! Thanks guys! :-)