Welcome to the Allergy/Asthma forum! It sounds as if your asthma is not being treated for the underlying cause--inflammation. Like Judy2 said, you need to get into treatment with a good allergy/asthma specialist. When you just use a rescue inhaler, you're treating the symptoms, rather than the cause (inflammation/allergy), and the lungs can become more and more inflamed, thus creating an even more critical breathing issue (like when the school nurse wanted to call an ambulance).
If your parents have insurance, you need to get an appointment with your primary care doc, and if he/she can't help you, get a referral to a good allergy/asthma doc. If not, get yourself in to a clinic for treatment. Believe me, I know what you're going through, as I'm an asthmatic as well, and my problem started in my childhood.
Please seek medical treatment. They can give you an maintenance steroid inhaler that can reduce the inflammation in your lungs, which will heal them and make it less necessary to use your rescue inhaler.
Hang in there!