Hi @Jodpri,
Awful isn't it.  I remember going to work on three hours sleep many many times at the beginning.  Sheets on sheets off aggghh.  Some people find the melatonon useful.  I never did.  Endep helps some people, as does something like sleepright from the pharmacy.  
I could never really find  anything that helped (except codeine, but you can't really take that every night unfortunately) just had to wait it out and I lived on Berocca and cafeine during the day. Still do sometimes.
Maybe ask your GP about the Endep depending on what other medication you are on.
I had the fan on flat out even through winter and a cold towel draped accross my shoulders, if I was cool I found sleep was a bit easier.  It does get better with time (read that as 18 months) but that doesn't help at the moment I know.
All the best lovely.  Have a look at the Night Howls thread as well.
xoxoxo