"User1471... Thanks v much for that name, will definitely look into her - just when I was feeling I'd read the whole internet to no avail I clearly hadn't as not heard of her! DD is on medication, but I may need to go back to gp and HV (not much help beyond 'some just don't sleep well' but I should persevere)"
She really is helpful - I cried when I had an email from her team, I felt like finally someone understood. She has a chapter on reflux and sleep in her book and you can arrange a Skype call.. I think it was around £60 per half an hour, which depending on your situation may or may not sound like a lot... but I think when you are at your lowest ebb, you'd do anything! (by the way, I have no affiliation to her whatsoever!)
Going back to before you had your baby...if you had got up several times a night, every night, for seven months to complete a task - then try and fall asleep between each task - do you really think that you'd have been feeling at your sexiest best?
You are exhausted. There will always be people that you hear about that are existing on half an hours sleep a day, raising ten children whilst working their way through the karma suta, but you're not. It's not important what everyone else is doing, the only thing that matters is what you and your husband are doing and how you feel about it.
Sit down with him and tell him how you feel, tell him what you have told us and that you miss him. Ask him how he's feeling and what he is finding hard. You won't necessarily have the answers to solve it all in one go, but you'll both feel closer for being listened to and can start to agree on some steps forward. Maybe start with the sleep thing.. and work with an expert to create a plan for your family. To add that I found out that my dad was dying from cancer at what sounds like a similar time to your husband - I cannot emphasise the impact that additional stress, grief and worry has on you day to day... you are in the 'for worse' stage of your marriage vows. It's understandable that some areas of your relationship take a back seat whilst dealing with those things.
As for the reflux - if you think this is not being well managed, push for a referral to a paediatrician who specialises in this area. In my experience (and I feel like a reflux expert these days) GP's do not have enough information about the condition. Alison SW has a lot of useful advice on how to best take prescribed meds (ie, I hadn't been told not to take a particular medication one hour either side of a milk feed for example)
Take care and wishing you good luck x