I'm sorry you had an episode of shortness of breath. I hope you get some more answers soon.
Please keep in mind that I'm not a doctor, and have no medical training at all. It's my understanding that rescue inhalers can work near-miracles for the most common causes of shortness of breath (dyspnea), such as most lung problems including asthma, allergies, COPD, and inflammation.
However, they won't resolve an episode of shortness of breath if it is caused by other things, such as a pneumothorax (collapsed lung), or issues outside of the lungs such as pulmonary hypertension, heart failure or heart attack,
Since so far you've had an isolated event, and it was perhaps mostly inspired by the infection or a clogging of the airways due to phlegm, you might only need the inhaler temporarily.
You might want to consider some self-monitoring while things are getting sorted out. They recommend that all people with systemic scleroderma take their own blood pressure daily, to detect and alert for the initial signs of sudden kidney failure or other complications. Simply taking and charting your blood pressure and pulse once a day would establish your baselines (if you aren't already doing this.)
Then, since you have lung concerns now, you might really like to have a little device for measuring your oxygen saturation. An oximeter is just a tiny (and rather inexpensive) device you clip onto your finger whenever you want. Normal sats for entirely healthy people are probably about 96 to 100%.
Your lung doctor can advise you as to what they consider a reasonable cut-off point for you, but the general guideline for oxygen supplementation to be covered by insurance companies is that sats regularly fall below 88%, on testing in the doctor's office, either at rest or with a medically supervised six-minute walk.
Those technical details aside, you can buy a pulse oximeter online, or at a drug store. They are often used by athletes. The peace of mind they can deliver for someone with lung problems is amazing! You can know whether or not you are over-exerting, or if your shortness of breath is caused by an actual lack of oxygen -- or something else.
Tracking readings once a day for years can establish a pattern, and you can know very quickly whether you are improving or worsening with medication or exercise. It's something to consider, at least, if you don't already have and use one.