I couldn't sllep for the first 4 months; infact, i would almost say I didn't need to sleep. It started to ease when I was able to start 'exercising' the mind during the evening. When I could finally start to read again, I found it took away all the 'noise' and 'buzzing' that went on in my little head.
As a chemist, I would suggest you ask your GP for zopiclone rather than temazepam. Personnally I think it works better, and is certainly 'cleaner'; is less hangover effects the next day. Added advantage that it's not a Controlledd Drug, so your Dr will be more relaxed about it's use.
I am now seeping well; but am only working parttime, so the work nerves haven't really kicked in yet.
good luck