I just met a girl in October who got one of those blankets, here at Mayo Clinic, while in the Psych ward. She told me how great it was! It's snug, but not suffocating or super-hot. It's very reassuring.

Maybe you can try looking at Mayo's site? Mayo isn't real cheap though... I would make sure that whatever you choose is the right one for helping you sleep. Sure would hate to buy the wrong one, or spend the time and money producing one that doesn't work for you.

Best wishes to you!

ETA: http://www.weightedblanket.net/faq.htm
Lots of Q's and A's on this site, if you haven't checked already