Buyer Beware Simmons Black Marila plush pillow top

I was in love with this bed until, after 1 night. So far, so Bad, too soft, Too hot. I have never heard of buying a mattress and have it sink down in just one night. After about one night the foam top has permanent impressions it sunk Like Titanic. I wakes up with shoulder pain and Back pain. I spend half the night trying to balance myself so I don't roll into the sagging portions.I am 5' 6", 158 lbs. I now have night sweats. no sleep. I feel like such a sucker.