Out of curiosity, do you have AC
in the apartment? If you do, is it a central system(ceiling or floor vents)?
A neglected AC
system can harbor some really nasty stuff, especially in high humidity areas such as yours. Even a window unit can if it is not installed properly(not pitched/level). The water sits in pan with all the dust/hair/etc...It makes a nice breeding ground.
If the drain pans are not cleaned and/or treated with biocide, you can get a nice bacterial soup brewing. Legionnaires Disease can be transmitted via ductwork and is much more common than people think. Most times people get it, they are diagnosed with "pneumonia" and treated as such(which normally cures it).
I had a coworker who got "pneumonia". He was treated with antibiotics and was fine for about 5 months. Then he became ill again, with what looked like pneumonia. When the doctor realized he serviced AC
units, they gave him a test for Legionnaires and it came back positive. The doctor admitted it is not something normally caught. It's usually treated as pneumonia and neither the patient nor doctor even know they had it.
We traced the issue to an AC
unit in Brooklyn that was used/serviced sporadically. An ex-employee had neglected to use biocide tablets for a few years during his service routine(hence the ex part). The unit was serviced once in the spring and once in the fall by the new employee...about 5 months apart.
If you do have a central ac
system in the apartment, you could ask to have hepa filters installed and some biocide tablets dropped in the drain pan. They are both not that expensive if bought online. It's affordable enough where you could even supply the filters/tablets if they were unwilling to purchase. The filters help greatly with people who have allergies. The electronic air cleaners that mount on the ductwork work best, but are a bit more costly and need to be installed/wired.
There are also stand alone air filtration systems that work well.
Good luck...I grew up with horrible asthma and know how much it sucks when you can't take a breath.
What is your SPo2 level at when you go to doctors? I get terrible headaches when mine gets low(when I get colds/flu/etc).