Lieze, I used to get all these feelings pretty frequently. My PoTS specialist said they were from too much adrenaline, but often confused with panic attacks. I would check my O2 sats while I felt like I couldn't breathe and they were normal. I also had a peak flow meter I used and it was normal too. I started taking Lexapro about 7 months ago and these episodes have decreased dramatically. If I remember right, don't you have Lexapro sitting in a drawer that you are too scared to take? Again, that sounds just like me. Just thinking about taking medicine could throw me into one of those spells. I finally decided I owed it to myself to try the Lexapro. My dr ordered liquid so I could start out with the tiniest dose. The first night I took it all I did was put a drop on my tongue. Then every few days I would increase the dose a tiny bit more. I am up to 5 mg a day. I have truly noticed a difference in the adrenaline surges/panic attacks or whatever they were. I am very glad I decided to give the Lexapro a try. It was very scary when I first started taking it but I figured by taking such small doses and increasing the dose so slowly that if I had a reaction it wouldn't be too severe. Of course I had benadryl beside me every time I took a dose just in case of an allergic reaction and I made sure I had someone with me who knew I had taken medicine so they could keep an eye on me. I never had any problems with it like I've had with other meds. I just wanted to share my experience. I hope you feel better soon. Oh and I have low blood sugar, too. I eat small meals all day long to help with it. Hang in there and take care of yourself. Babette