No way to tell, many facts missing from your post that an attorney would need to know.
Contact an attorney in your area immediately.
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Apparently you took too many pills and couldn't be aroused from you sleep. An attorney would have to look at the facts as the people who dealt with you saw them. While the truth is that you weren't trying to commit suicide, it seems like the evidence in their eyes made it seem that you did try to commit suicide. Thus, steps were taken to make sure that you didn't commit suicide and wouldn't commit suicide if released. As far as your children, Unless there was another parent or relative available to care for them while you were in the hospital, CPS didn't really have a choice but to provide care. I not sure why you don't have your kids back. It seems unlikely that you could successfully sue for a violation of your civil rights on the facts that you give, but the only way for you to truly know is to talk to a civil rights lawyer in your area and give him all of the facts.
Only an attorney who knows all of the facts and circumstances can answer this question. There are many more sides to this story than yours.
R. Jason de Groot, Esq.,