Hello, I am also so sorry both of you also had to experience this. I, too, had carbon monoxide poisoning this past winter from a leaking furnace and since then have developed POTS and mast cell activation disorder. Prior to the CO exposure, I was an avid runner and have always been incredibly active. One of my first symptoms during the slow CO leak was shortness of breath (the feeling of air hunger like I could never get a full breath). I was also nauseous, fatigued, and dizzy at times, which was always worse on the weekends when I was home more. It’s most likely that the exposure lasted all winter, but when I stayed home from work because of these symptoms in February and progressively got worse to the point of becoming hypoxic and being rushed to the ER, that’s when my POTS developed. Unfortunately, the air-hunger/ shortness of breath has not gotten better despite being removed from the CO. Have either of you also experienced this? If so, did anything help to get better? it’s my absolute worst symptom to the point where I can’t really do anything because I always feel like I’m suffocating despite having 100% oxygen on the pulse ox. I know POTS can cause breathing issues, so I’m wondering if it’s related to that. Any insight would be so much appreciated. I hope you are feeling at least a bit better now. Thank you!