This illness did take a sudden turn for the worse and I ended up in the emergency room. It was bronchitis. (Thankfully not pneumonia.)
I received two breathing treatments before being allowed to return home, along with antibiotics and something with codeine to ease the cough.
This has been one of the most miserable experiences I can recall. I have a new found sympathy for people with asthma.
Thank you for all the advice and suggestions. Keep up the prayer, I still need it for a total recovery.