AJP - i hope your girls are getting better.. it's horrible not knowing.
my DD is also sick, started as a viral infection over a week ago with a rash, random high temps, sleepy etc etc, took her to the docs on friday after 3 days of being sick told it's a viral infection should last 3-5 days, took her back again Wed as she was now getting a cough on top of it.
She now has a COLD and a viral infection and at times wont drink properly, someone mentioned to me that you can get HYDRALITE ICY POLES which help with dehydration, am not 100% sure on the age they can be used from but these may come in handy if you need to get some extra fluids in?
I think this is pretty much a last resort but doesn't hurt to know there is something there!

Other than that i can only suggest the same as the girls, i am trying the panadol/nurofen combination, letting her sleep and lots of cuddles oh and the wiggles and hi-5 work a treat..

Sorry prob haven't been much help, hope they are on the mend and big , keep up the great work!