A year ago I purchased a natural latex firm mattress. I'm not happy with it. It's already dipping in the middle under my hips, even tho I rotate it every 3 months. I'm only 106 pounds, so it's not like I'm denting the thing in! Now my left leg and both arms go tingly and numb when I sleep. I start out stretchlying, but it still happens. Any suggestions?

