Re: Low peak flow reading, but don't have asthma???
Those readings are quite low for a tall woman such as yourself. There shouldn't be that much variation, either. Such high variation in readings are a sign of a lung problem. Could be bronchitis, could be asthma, could be something else.
It's possible to develop asthma for the first time at any age. It's also possible to have asthma and sensitive sinuses even if you don't have allergies.
See what the pulmonologist says. Meanwhile, try to keep track of when you feel short of breath, and what you are doing at the time. Definitely use the albuterol if you need to. Did someone show you how to use the inhaler correctly? It's not obvious.