Jemima, I sympathise so very much. Without boring you with endless dull history, in brief I have suffered from insomnia for about ten years now. Since having my first baby 8 months ago my insomnia has become cripplingly worse...my DS causes no trouble at all, I just couldn't sleep!! It got especially bad with anxiety, panic attacks and even some depression when I stopped breastfeeding him at 4 months.
I only reply because I agree with the other posters advice to you. I am a professional insomniac, I have tried literally everything, and I just don't have any evidence that any non meds approaches work. Once you are obsessing all day about not getting any sleep, I think you need some proper drugs. I have always hated being addicted to sleeping pills, (zolpidem also only works for me) and don't feel able to take more than 2.5mg anyway unless someone else has the baby monitor. I also thing zolpidem contributes to my 3am waking.
Before and after pregnancy I wasted far too much time trying and failing to get properly onto a SSRI drug to address my sleep and anxiety about sleep....so many times I stopped in under a week because I found the side effects so awful. The two times I have stuck with it, my sleep has returned and life has been joyful again. Before pregnancy I had success with venlafaxine, and since pregnancy I am now having success with escitalopram. I know every person is different, these are just what have worked for me. Both times it took up to a month for side effects to go away, and sleep to get really good again. But my god was it worth it. Suddenly I am enjoying my beautiful son the way everyone promised I would.
You have so much sympathy but my prediction is that only proper meds will cure you, and the faster you decide to get over the initial start up hurdle, the faster joy will return to your valuable days.
Good luck and please keep us informed!