I am so disappointed. I wake up in pain and can hardly walk.

I was so excited to get this bed. I really thought I was going to have something that would give me a good night of sleep and give me support. Boy, how wrong I was. Every morning I get out of bed and I can hardly walk. It sinks in the middle, so I roll to the center. The middle is higher than the head or the foot. It is a horrible feeling! I have noticed that the sides (which are supposed to be excellent for support) are starting to collapse and sink while I am sitting for a few minutes. I have measured where the mattress has sunk an inch already and I have only had the mattress 6.5 months! I truly believe it is a defective bed. Nothing should collapse like this mattress after such a short amount of time. I DEFINITELY do not recommend this mattress!