I had scabies on and off for 2 years up until a couple of weeks ago. I think what cured me, touch wood, is taking neem tablets. they take about 4 days to make a difference so if you try this method don't give up after a day or two.
Also what I had been doing for a couple of months before this which made having scabies bearable, and not feel like the end of the world, is to rub a thin layer of parrafin all over. I did this just before bed and doing it will give you a few hours to get to sleep and you will stay asleep too. This comes with its obvious risks but it isn't as crazy as it sounds you shouldn't be pouring the stuff all over you just dip a cloth in the parrafin and then ring it right out before you lightly rub it on your body. Parrafin is actually an ingredient in some permethrin creams and also is in other face and body creams too.
Good Luck, M10