S.H.
... wow, gosh I really wish the best for you...
when things do stabilize or maybe even now,... perhaps something like the Big Brothers/BIg Sisters organization might be able to provide a "mentor" /role-model for your kids....since you are a single parent.
Here is a link about it:
http://www.bbbs.org/site/c.diJKKYPLJvH/b.1539751/k.BDB6/H...
My friend, who was also a single-parent with 3 kids boys & girl... got a Big Brother for her sons... and it made a world of difference in her sons. It really helped a whole lot. Her sons were real lost too, and just not going in the right direction. But this put a positive spin in their lives and they returned to being the kids she always knew they were. Good kids. And it is not something you have to pay for. For your daughters too, maybe a "Big Sister" type mentor might help them.
I wish I had other answers for you... but I hope this helps or at least gives you ideas.
May everything work out,
all the best,
Susan