Hopefully someone can give me some advice.
Firstly, I'm not in bad shape (I couldn't go run a huge marathon but I'm a healthy weight and exercise pretty often). I've been having a problem breathing for a year or two now. Sometimes walking up a short flight of stairs can cause me to lose my breath, and it takes me quite a while to regain it. When I exercise (an amount I'm used to) within about 10 minutes of starting I completely lose my breath, I can't take a deep breath, there's a tightness in my chest, my heart pounds, and I have difficulty swallowing. I'll have to stop for at least 10 minutes, and then I can generally continue (I'll still have shortness of breath but not enough to make me stop). All of this makes me dizzy and I've nearly passed out a couple times. I don't wheeze or cough.
My doctor said "it's common" and told me to go home. I did some research online and when my symptoms didn't get better, I went back to the doctor and asked about exercised-induced asthma. The response was "yeah that could be it" and I got an inhaler but it didn't do much for me. Then I asked my doctor about a pulmonary functions test, and they sent me for one. When I did the pulmonary functions test, the person performing the test had me breathe into the tube a few times, then commented that they needed to check my oxygen levels. Then they had me take 4 puffs of the inhaler and tested me again.
A few days later my doctor phoned and said everything was completely normal with my breathing. I don't understand why they would have me take over twice my prescription (4 puffs instead of 1) when I was fine to begin with?? Maybe this is normal though?
I don't know what to do. I'm still having major trouble breathing and my doctor hasn't recommended any other tests.
If anyone has an idea what this could be, I would love to hear it