I have an appointment tomorrow with a lung specialist. A recent test showed something of concern (non-cancerous, they believe) so I'll have a better idea of what's happening soon. Current thought is that the chest infection that started all of this back in April might have caused permanent damage. Right now there's just too much unknown for me to really say more. I'll update when I'm able to.
Overall, I feel better than I have in years, ironically.