Hi, I’m a 17 M and for a few weeks i feel my heart rate really fast when I stand up, it goes from 70-90 bpm to 100-120. And then when I do little effort like walks and going upstairs my heart goes to 150-60 bpm. It really gets my anxiety worse feeling this heart rates and doesn’t let me leave my house freely, but I also think I’m getting obsessed with looking at the oximeter, which is bad. Sorry for my bad English !