Sleeplessness

I cannot fucking cope with this lack of sleep. I slept for about 3 and a half hours last night, have now been awake for 17 and a half hours, have taken a Diazepam and a Zopiclone, and I still can't sleep. It is 3:30am. I spent the whole day absolutely exhausted and have been feeling completely drained and really shit, and now I can't sleep. I am desperate to sleep, and I am exhausted, but just not sleepy. I don't know what to do. I am too tired to even think straight, and yet I can't sleep. Last night I was exhausted and yet still couldn't sleep until 6:15am, and even then kept waking up. Admittedly I hadn't had a Zopiclone then, just a Diazepam, as I needed to be able to get up this morning, but I still spent the night incredibly tired and yet unable to sleep. I was so convinced that if I didn't nap at all today that I would sleep well tonight, but no. I feel like my body is betraying me in every way it can - first not losing weight despite eating an amount that should have made me lose a good half pound, and now not being able to sleep despite being completely exhausted. I feel like crying, but I am too bloody knackered.