Hi, thanks for all your responses. I’m not sure how to respond on this message board to anyone in particular. I’m brand new. Despite having POTS for years. The oxygen problem is caused in part by what’s called a shunt meaning some malformation in my lungs but I’ve never had a problem until the last couple of years. Now I am in Santa Fe. I have arrived yesterday and my oxygen is going down to 90 or 89. Not sure what to do. My blood pressure remains OK so far. My heart rate is a little high. I have slight headaches but I seem to be pretty OK although Pretty winded. Any suggestion for what to do about the oxygen? Anyone else have shunt long with POTS?