Hi Eric, and thanks for your post. Although we cannot provide medical advice over the internet (for your own safety), your concern certainly warrants a response.
In the most general of terms, many physicians advise patients to use their rescue inhaler at the onset of an exacerbation.
This may apply in your case, it may not.
This is definitely an issue you will want to discuss with your prescribing physician. The doctor will be able to guide you what is the best course of treatment in your particular situation.
Since your post is from about 11 hours ago, I was wondering how you are feeling now?
Please do let us hear back from you when you are able to and have the time,
All the best,
Leon (site moderator asthma.net)