I assume that you are certain that you aren't pregnant already?
If not, then tbh I think it's just as likely to be stress stopping you from ovulating as it is the breastfeeding. You do sound really, err, to quote you, desperate!
When you say 'getting on a bit', how old are we talking - over 40?
I was in a similar situation to you nearly a year ago, but then my periods came back when dd was about 9 months (I was still bf lots more than you). We also took several years to conceive dd. I'd love to say that we fell pregnant straight away, but sadly we're still trying, but I know someone else who took 7 years to conceive her ds1, and is now pregnant with her ds2 who took just 1 month to conceive!
I guess the point I'm trying to make is that unless there's a known reason why it takes you a long time to conceive, the time it took first time generally has no bearing on the time it takes second time.
On a practical note, you might want to try reflexology and/or acupuncture, either of which would claim to be able to help.