Dior, please just keep G as a colleague you have a friendly, slightly flirty relationship with - don't revisit the 'shall I shan't I' scenario...
As for H, what can one say? Once again, it seems to revolve around doing things to make him happy - what about you? What does he do for you? To be realistic, do you really think you'll ever be a size 8 fantasy of his again? Not many of us are the size we were in our teens or 20s or ever expect to be - but most of our men seem to have adjusted to that and heck, how many of THEM are the fine examples of the Superb Powers of Virile Manhood that THEY were at 21???
So, assuming that he can only relate to you sexually when you're stick thin, and assuming that you won't be even if you do lose some weight, do you think you can last the rest of your life without cuddles and sex? Why should you do everything on his terms? Why has he been allowed to so colour your self-image that you feel so depressed when you look in the mirror - and if you do lose weight, you'll spend the rest of your life dreading the bathroom scales. That's no way to live!
Dior, I do feel so sad for you - I can't recommend a sex-less marriage - tried that - didn't work - wound up having affair with ex-boyfriend and it was dreadful for my ex and dd, even though ex boyfriend is now dp and we're sort of living happily ever after. But I shall always have the guilt - so wouldn't recommend that either.
Anyway, that's why I keep thinking you need to see Relate again to thrash out what YOU want with a third party present - so far it seems like it's all about him.