Hi Candy,
Two things:
Panic attacks often come out after a period of holding ourselves together. This is one of the ironies of the illness. You have done a lot recently, and the key now is to let go of some of that pressure.
Your sister offered you 'support'. In my book that doesn't include any form of complaining. This should not be happening!
I think if I were in your spot, I would 'play dead'. Just look and act as tired as you I really am, and let the relatives say what they like.
You can always vent here at PC.
((((((((((((((((Candy))))))))))))))))))))
Good thoughts, M