My mum did respite and emergency foster care for a number of years (only stopped because of a longer term foster placement which turned into an adoption)
The respite in particular really seemed to work for both kids and parents - the kids had a few days away from home, almost like a mini holiday and the parents got a much needed break.
As I got older I actually taught some of the children who came to my mum, and can say that the fostering didn't seem to have a negative impact - children who are fostered are already living in a difficult situation (hope you know what I mean) and in many cases it was actually a positive thing.
If the help is being offered I would take it, bue be clear about the kind of help YOU want.
I really hope you somehow get a break and the help and support you need.