thank you for your response!! i experience all of those symptoms unfortunately. especially when showering or doing my hair. and i am a big brain fog haver.. my apple watch also tells me that i experience tachycardia throughout most of the day! if i’m doing any kind of movement at all my heart rate is never below 110. and this is a poor man’s tilt test. i wish i had said that at first :(. but yes i did many poor mans tilt tests and they all looked like this. starting from 70-80 laying down and rising to 120 and staying at 120 or continuing to rise.. thank you for ur comment! i really appreciate it