I have serious mood swings - crying over unopened jars one hour and hyperactive the next. Pointers?

I have serious mood swings - for the last two or so weeks i have been crying because i couldnt open a jar and like crazy happy for no reason. i cant sleep ( i'm averaging about two hours a night) but im not necessarily tired, im less alert but im agitated and restless and cannot sit still so i will just pace around the kitchen all night long i cant seem to concentrate on any of the things i used to and in the last few days ive been thinking about different ways of dying. dont misunderstand me im not depressed or unhappy its more of a fascination of what it would feel like, and almost everything that certain people say makes me want to explode at them. Im also on 20mg temazepam per night to help me sleep but i still dont usually get to sleep till around 4 - 4.30 when my average bedtime is 8.30 - 9. Help.