OP please listen to this advice. You may not think it's warranted, but please talk to a health professional about this. Your post has telltale signs delusional, paranoid thinking.

The worst that can happen is the doctors will say nothing is wrong and you will be out a few bucks. But more likely they will help you find out what is happening much better than strangers on Lemmy ever could.

If you absolutely refuse to go to a medical professional, at least check your apartment for carbon monoxide or black mold.

Good luck.