broomformychin, you poor thing!!!!
My DD was mirror image of yours. Doing ok at night by 12 weeks (finally, she hated the moses basket with a passion, but things improved at 9 weeks when she went into her cot in her own room). ONLY slept in the sling in the day, or occasionally in the car. I used to walk her for up to 2 hours, twice a day... I was tired, but certainly shed my baby weight!!!
The night time routine WILL work, it just takes time. My friend rang me in delight to announce her 20 week old has just gone to sleep BY HIMSELF in his cot tonight, after a bedtime routine at a very set time (to fit in with her older DC) since the day he came home from hospital. Don't panic. I drove myself crazy worrying about it. BTW, DD is 12 months now, she goes to sleep by herself night and day in her cot. I walked her to sleep til 9 months (did progress to Ergo baby carrier on back) in afternoon as she'd only sleep in cot in morning for her nap, (from 7 months ish she'd nap in her cot in morning)...
Your HV is WRONG, you shouldn't be leaving a baby under 6 months to cry. The sleep centre in America who did all the resaerch say not til then. My HV told me not til then. Yours is an evil witch. Even though mine is sensible, I have avoided her like the plague since DD dropped 2 centiles on the growth chart and they made all kinds of fuss (she looked fine and was thriving in our opinion- and I'm a paediatric physio and DH a GP). Your DH is probably just worried about you. It will improve though. I met other mums at a baby group who walked ther babies to sleep, and sometimes we met up to do it together?? It certainly helps you feel less drudgey-chore about the whole thing?? wonder if thats an option for you? But don't listen to anyone who tells you if you're doing it now you ALWAYS will be. It panicked the hell out of me and wasn't true. I almost showed up as pnd on that silly questionnaire, i was so exhausted and feeling so low... I was just tired. It improved!! Send DH out with her in sling whenever possible, like at weekend, and put your feet up for a bit. Amazing what an hour's break does.
Chin up chuck, you're doing great, and many people can't do the leave-to-cry (especially me!!!)