Update:
It took FOREVER for me to get my iron levels back. Appointment was delayed twice and then two weeks for the doctor to finally sign off on the results. In the meantime, after taking 3 weeks off from running, I feel even worse than I did before. Legs are extremely fatigued from running 7:30 pace on a 4 mile run. I don't think I would break 5 in a 1600 right now. Breathing is still fine, though.
Ferritin came back at 36. Negative for mono too; other vitamins normal. That really isn't low... I was expecting something like 10 with the way I feel. Still on the lower side so I scheduled another appt to get dosing for iron just to see if it helps and maybe review other possibilities.