Morning Brave Babes.
anon - I'd say the same, 4/5 days BUT if you're ill or have a lot on your plate, it could be longer.
Nytol herbal or Sominex/ax are another sleeping tablet that I've used short time.
Try and get yourself into a routine. Warm bath, warm drink, fresh PJs/nighty (or not
) and read in bed.
Give yourself a good hour to unwind. No tv, no noise as such, just a nice quiet, warm room. 
Where are Silver, Red and MsGee? Have they been around lately?
thurso - you know my thoughts on this.
Is there any kind of printed info you could hold of for him to read?
My GP is from Australia and told me they treat 'mental health' very differently over there to here.
He said the 'docs' here tend to look for reasons why you are not mentally ill. rather than to look at the reason for you being the way you are IYSWIM.
If this is a chemical imbalance, then your DH needs medication. I think that maybe there is something about his previous experience with his tablets, that is making him reluctanct to go back down that route.
There are so many different things on the market these days, he just needs to give them a chance to work.
Maybe he's scared of the initial 'dip'?
Sorry, waffling xxx