My sister took ambien and she never had any hairloss...
Maybe you could try adding some soy to your diet. I have read that it maybe helps stimulate growth and is good for hair health.
Anyways IF the hairloss claim about ambien is true (which I kind doubt it is~you CANT believe everything you read online) I highly doubt it is permanant. And,didnt you say in another post you are having some regrowth? Just relax a little~I think i about 6 months you will feel much better about it.