With a sports watch I found out my HR goes up with more than 30 bpm withon 10 minutes when I move my limbs, but not on standing still. I can put on a sweater lying down and have HR of 120, and can stand with normal HR as long as I keep still. I have many other symptoms of dysautonomia, such as thirst, salt craving, dizziness, blood pooling in legs, cold feet, stomach ache, hyperacusis. The typical remedies for dysautonomia help me as well. Support stockings, salt tablets, elevating bed head, SSRI. On PR and a dysautonomia forum I found no one with dysautonomia without OI. I have ME ICC dx and hypothyroidism, though the latter only became apparent in recent years and the ME and dysautonomia decades before.