Hello Mike,
Some days what life throws in the path is none too funny. It is then that our yoga is truly tested. The fortitude of a man is determined in the gale force winds of the storm, not the comfort of his living room yoga space.
When I respond to these sorts of posts I try to both directly answer the question and respond to the more subtle question(s) between the lines.
Yoga you can begin immediately. Asana is another story. The student must have an incredibly mindful practice when recovering. The nervous system supports healing when it is parasympathetic. Therefore anything jarring, alerting, requiring defense, aggressive, violent, or threatening would be counter productive to the healing process.
Two days ago I observed a woman hobble into the local co-op with a cast on her leg. She bounced up to the deli counter and ordered a cappuccino. My inner light bulb lit up. “why would someone who’s recently broken a bone, is now making healing demands of the immune system to repair that bone, why would such a person be drinking coffee?” But I suppose it happens every day, all day.
I bring this up to point out that the practice (asana and pranayama) the lifestyle (running around like a banshee), and the nutrition (hydration, oxygenation, and alkalinity) all need to fall inline when your body has been traumatized. So I’m hoping you are making said alterations to maximize your recovery. There are specific things to be eating (and avoiding) Please ask your teacher for these things.
Absolutely get clearance from your health care provider before returning to any activity and then wait an additional two weeks after that. Once you return, please do so under the watchful eye of a therapeutically trained, senior yoga teacher in an alignment-based practice. You do want to begin the process of rediscovering your respiratory functions but not do so in a way that is harmful.
For now I’d begin very gentle breath awareness in the supine pranayama position IF that position is okayed by your primary health care provider. Ask your teacher about breath awareness exercises which are the precursors to pranayama. This will cultivate a greater awareness of your ribs, intercostals, lungs, et al AND provide you a parasympathetic nervous system response so that your bod may do its best to mend.