I've been having this really odd experience where my oxygen levels are consistently around 98 to 100, and my blood pressure is at 12074, which seems normal. But at night, I often feel like I'm not getting enough air or like I can't breathe, even though the oximeter says I'm at 99 to 100. It'll wake me up, and it makes sleeping kind of an anxiety-riddled task because I'm worried about not being able to breathe even when I'm actually doing it. I talked to a doctor about it, and they had me do a chest x-ray and liver function test, which came back alright, and gave me some meds. Still, when I try to sleep, there's this constant fear of being short of breath, and, for like 10 to 15 seconds, I actually do feel breathless. Any advice on what might be going on?