Hello, everyone! I've been lurking for awhile, taking it all in. I have an 18 year old son with Asperger's, developmental delays, and PANDAS. After watching my son lose 60lbs in 18 months due to severe nausea, worse in the am, with no answers from 2 pediatric GI's, I finally figured it out myself. I Googled red hands/feet, low bp and temp, and weight loss/nausea. I really had no idea what I would find, but I did it! Two different doctors at The Children's Heart Institute have observed postural tach, hr doubles. Ttt was one of those occasions. Dx has dysautonomia, likely POTS. We have to see Dr. Abdallah for further tests and treatment. Trying to keep an 18 y/o (with a healthy desire to be independent) who has Asperger's inflexibility, poor reasoning skills, no concept of time, and very poor memory due to dysautonomia on the road to health is daunting. He wants to get better, even thinks he is drinking enough... And, he has been sick his whole life, so he doesn't even perceive/report symptoms. I have a few questions: * Why more tests? He's had an echo, ekg, holter, and ttt. What else can we expect? The last doctor mentioned bloodwork, beyond the regular ones he always gets. Looking for what? * How does heat affect you? My son became very pale, slow, and weak from running errands with me in a car with minimally functioning AC. Why does this happen? How cautious should we be? * Is tachy dangerous? He does not perceive it. Do I need to worry? What, besides standing, can bring it on? Heat? * Sometimes, I see him pushing so hard to physically keep up with his friends on outings. I know he's not feeling well, but I stay out of it. He needs some normalcy and independence. Am I doing the right thing (particularly in this heat?) Or should I limit him a bit until this condition is under control? He is 18, but I do have legal guardianship due to mental impairments as a result of his poor health. Thank you for sharing your knowledge and experiences. I admire all of you for putting one foot in front of the other each day, feeling energetic or lousy.