This sounds awful and so sorry it happened to you.
You've very likely got injury and ongoing inflammation of your airways and the gas exchange surfaces in your lungs. This thing is no joke, it's like smoke inhalation or a snootful of chlorine gas. Thank God it's as mild as it is! I would suggest going a little easier on yourself and giving the situation a few weeks or months to improve, while expecting a full recovery.
A resting O2 sat of 97 is okay, but it doesn't say anything about what's happening on the bike. It could be worthwhile getting a reliable pulse oximeter for use during exercise as a reality check while you recover. It's not something I know much about, but 88-92% has been used as a training target for clinical populations. There are also pulmonary rehab programs and I bet a lot of them are getting very good and seeing their share of athletes these days.
Seriously, all the best and I hope you're back to 100% in a few weeks, but in the meantime take it easy and let us know how it's going.