Everything hurts :/

i've been thinking that's its been sciatica but now the whole of like my pelvis area hurts. Mainly the bones of my buttocks and then my hips. Even using my legs ti turn over in bed or putting my knees on the bed to turn over leaves me in excrutiating shooting pains in like bottom of my bum cheeks. Anyone know what this is or how to relieve it? It's 1.45am and I'm sat in a hot bath, falling asleep but scared to get out because I know how much it hurts to stand!