Seeking medical advice

 Those of you who said you’d had the mystery cold or flu that’s been going around, does this sound familiar?

I had a COVID test - drive-thru, self-swab, wait for results - before Christmas, and it was negative. I started feeling a bit better around the 26th, but whatever is going on has ramped up, and I (and a few others) suspect I might have gotten a false negative. It’s now 16 days since I first started feeling unwell  

My symptoms: extreme exhaustion, dizziness, and shortness of breath after any activity, such as getting off the couch and going to the bathroom. According to the oxometer, my oxygen level is generally around 96, and my pulse will jump by as much as 30 beats after any exertion. I can feel slight resistance when I inhale. I haven’t had any fever or chills, and the body aches/headaches are at my “normal” everyday level.

So, have any of you with the mystery bug had these symptoms, or do you think this points more to COVID?