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I'm sorry to hear about your situation. Unfortunately I have not been able to find any active class action for either Adderall or Xanax. And any cases that I have found (that have been dismissed) have not featured issues with comas in them, so even if they were still active they would not apply to your situation. Class actions are situational, in that the members of the class need to be similarly situated, so it almost always deals with a common side effect.
Now it's still possible that you could have a claim, but it would need to be in a new class action. I would suggest that you get your friends' information and contact a few class action law firms, letting them know your estimated damages from the side effects, as well as how many individuals you actually know, and letting them know that you have their contact information. A law firm is going to be looking at the likelihood of success in such a case as well as the recovery, and the damages times the number of claimants would be the recovery. You would still need to link the condition to the drugs, but if you have some expert to testify to that, that would suffice.
Hope that clears things up a bit. If you have any other questions, please let me know. If not, and you have not yet, please rate my answer AND press the "submit" button, if applicable. Please note that I don't get any credit for the time and effort that I spent on this answer unless and until you rate it positively (3 or more stars). Thank you, ***** ***** luck to you!