I had a bilateral on January 13th. I had only three drains. My husband emptied them at home, but it was just as easy to do it myself.
I slept in one of those surgical caps at night and my hair kept very well for a few days. After a week, I was able to bend over the sink and moving my arms from the elbows down only, was able to wash my hair. I cancelled my appointment at the salon.
I did not opt for reconstruction, so I can't answer your questions on how to sleep.
If you experience an emotional breakdown, just take a deep breath and slowly let it out. Now....doesn't that feel good. Good luck dear and I will be praying for you.
Sorry no one replied to your post yesterday, but most of the questions you asked would best be answered by the surgeon who will be doing your mastectomies, or the plastic surgeon who will be doing your reconstructions.
Best wishes...