Sickness beyond belief

I know there are like other posts regarding this, but I am sooo so curious if anyone else has felt on the verge of death since Dec 19-ish?

I in my entire life have never been sick like this. I’m vaxxed, I mask, I hand wash my hands raw and I don’t go anywhere except work and home. (I am a teacher- whole class was lying on their desks with headaches, fevers, and coughs the last week of school- but alas came to school anyways- and there they stay)

I’ve been in and out of doctors and medical clinics trying to get this sorted. I’ve been on antibiotics, inhalers, steroids and have tried otc stuff.

I’ve been resting and eating healthy and drinking water- taking vitamins and even had lung function tests done.

What is this sickness? I keep getting worse and I’m not better at all since the first day of break, having to go back next week but hearing everyone in me neighborhood hacking up a lung, family, friends are sick.

Tested negative multiple times and I’m just deteriorating.

Anyone else have this? How are you fixing it? When is the red line (go to the hospital and wait for 6 hours with other potentially sick people)?

What is this?

(Have caught something consistently since the start of school- different things every time and had only about 2 weeks in total of not feeling like death since despite taking measures) Also- I know it doesn’t help having over 30 kids in my classroom in a building older than my mom. This I can’t change but I take every precaution I can- including using an insane amount of sick days- where I’m liking impacting my “work ethic”-I’m scared to go back to work.