Kills my back, numbs my arms, husband won;t sleep on it

I had a 2004 Perfect Sleeper, decided I wanted a foam mattress, so bought a Vera Wang Perfect Sleeper that salesperson said was a foam mattress. After a few months, I noticed I had a "HOLE" where I was sleeping, I tossed and turned so much that my husband moved to the other room. I then slept on HIS side, and then developed a HOLE there, moved to middle but felt a hard ridge all the way down, called dealer, she said it was too late to return it and suggested I put PLYWOOD on bottom under the box springs! I tried this, and it did not work. Called the dealer, they said don't lie on it for 10 hours, then measure to see how much it sags...I told her almost 2 inches...she said the warranty won't replace it unless it is 4 or more. I then put the plywood under mattress, it did not help, I sleep across the top where pillows go for a couple nights, then across the bottom for a couple nights, then on one side and then the other, sometimes I lie across the bed...I am so disappointed in this bed. I want a new bed, and I want my husband back in my bed! Guess I should measure again and try again, the bed looks great, always covered by a cover...but beauty is only skin deep!