Just saw your note. If you have a car, this studio is in Southern Brooklyn, http://www.yogaspotny.com/. And in Tribeca, there are a number of studios, namely this one: http://www.kulayoga.com/kulasite/.
We have not solicited either one of these studios yet to see if you can get free classes, but if you wanted to start your practice there, and are willing to pay the regular fee (usually $15-20 per class), you can do that. I would advise that you start with a beginner or level one class, also listed as a "basics" class on these schedules. I believe that Yoga Spot has a "Gentle Yoga" class that would be appropriate.
Also, have you filled out our participation form? Until you are fully out of treatment, I don't think that we can get you into free classes. But consult your doctor about whether or not you can take classes and at least get started. Please email me directly if you have any other questions, sometimes these wall posts get lost in the mix!
Welcome to Yoga Bear! I see you have joined the NY chapter; you will find a lot of support for YB there! On the site, there are some bed yoga videos that you might be interested in. Namaste', Jean