i really hope you get some help with the pain etc soon, it sounds absolutely awful!
maybe your doctor can give you some stronger pain meds to use, maybe just at night to help you get some sleep? i was told i could use my tens machine all night if i needed to, so i bought some of the bigger electrodes of ebay (the really long rectangular ones) and leave them on my hips and si all night so i sleep better, i have a tens with 2 channels so can plug in 2 sets of pads.... i dont know how i coped with the little lloyds pharmacy one channel tens machine!
i dont know what to suggest, i have hip dysplasia too and get similar pains in my hip sockets when they are really slidy but i very much doubt they're as bad as yours so my little tricks to settle hips probably wont work. i find the tens the most helpful now i have the long electrodes, and vary the tens use with heat and cold patches depending on how the pain feels (hot pains i find respond better to cold, everything else to heat). and i rub some of my anti-inflammatory gel on my hips. ideally i'd take an anti-inflammatory tablet but tummy really doesn't like them! sometimes a gentle stretch and mobilisation helps, but not always. and i need to be very careful as sometimes this makes it worse. i wish my body could talk to me, would make things much easier!
my hips also seem to like being sat on my gym ball (maybe something to do with the angle? i dont know...) hopefully you'll find something helpful too!