Back sleepers, pillow rec?

[noodleoo]

I've always been a side sleeper, but I've been trying to sleep on my back to prevent plugged ducts while breastfeeding. It appears to be working, no plugs in 3 days (yay!!!!!!!). But now I have a horrible stiffness in my neck and shoulders. I have a memory foam pillow designed for side sleepers, so I'm guessing that's why. Any good pillows for back sleeping? I think I need one, it hurts so much.