Sounds like possibly Pneumonia if it wasn't Bronchitis. Odd question but do you eat food with a lot of potassium? I was sick with Bronchitis that got REALLY bad and I ended up in the ER and it was discovered that my potassium was dangerously low which was making me have terrible headaches and feeling overall terrible. If you don't, then that's something to consider. I think you would, maybe, benefit from a breathing/oxygen machine too.