Doesn't sound like a lot was accomplished today but at least she will be doing some testing and x-ray.

Did she consider any cardiac testing?

The inhaler would work IF (and only IF) it was a true asthma attack. If this is cardiac related, then it would not help your symptoms. I agree with you that it would be a big coincidence that allergies would cause this sudden symptom.

Did she do any breathing tests in the office? Or did she order a full set of PFT's with your x-ray next week?

Can you 'make' your symptoms appear by exerting yourself? If so then you need to tell her this and demonstrate this in the office so she can see it happen. Take her to the stairwell if necessary.