I remember when my husband was withdrawing CT from hydrocodone and methadone at the same time he got very depressed and suicidal. Cared about nothing and no one. He thought no one cared about him or wanted to help him. They are COMPLETELY different people at these times. Just remember that okay. Keep posting here, more people will respond with other advice :)
This is serious. Why can't she get another prescription for the meds she was on and then try to taper down off of them? I know this is hard for you, especially with the kids in the picture. If you can try to find someone to take care of them, maybe even put them in daycare. Or find a babysitter in the area that will work for what you can afford. I would try to get her back on those meds and then taper. How much was she taking of the Valium and Serepax? From what I know Serepax in and of itself is very addictive. Let us know how she is doing okay? Try to stay calm and not freak out because it won't help her or you. I don't think she needs to go to a mental hospital though. I think she needs to try to taper and see how that works.