tother,
To me, it sounds most like a chest wall inflammation, chostochondritis. It's been devilling mne too for the last two weeks after I stretched wrong first thing in the morning.
With costochondritis, it usually hurts when taking a FULL inhalation because that stretches the ligaments to their limit. Analgesics usually help. THe pain comes and goes and can refer to the arm or neck. In fact it can be a thoracic spine problem that gets the process going.
What it doesn't do it get worse with exercise and it dooesn't cause shortness of breath (just the need to take SHALLOW breaths.


) Unfortunately it can hurt for a week or for a couple months.
Most heart related problems DO hurt much worse with exercise and of course require more care and concern.
Try some naproxen a couple/3 times a day (Alleve, Naprosyn, both OTC) and see if the pain gets better.
If it goes on for too much longer, maybe a stress test with nuclear markers is a good idea. What does it feel like if you run for 5 minutes?
Ask your doctor what his reasons were for his thinking you might have asthma? If you DO, it of course can be the cause of your symptoms whether or not the Ventolin works. I'm not up on asthma but I'm sure there are better confirmatory tests than just giving a drug and shooing you out of the office.