I've read all this, but it's been a bit of a skim read, so I'll apologise in advance if any of this has been said.
I think you need to discover/re-discover your self esteem. I've read several of your posts where you do yourself down so badly. To be honest, you don't need your dp or your dd to do it - you do it to yourself.
There are lots of things about ourselves that we don't like. There are some things we can't do anything about. I'm 5ft 2, and would love to be tall - but that's never going to happen! There are somethings we can do something about, e.g. weight. If you're overweight, and it worries you as much as you say (because you're always talking about how fat you are!), then it is in your power to do something about this. (I know you're dieting at the moment - this is just an example).
Work out what makes you unhappy and then decide which of those things you can do something about. The ones that you can't do anything about you should put to one side - although you may find strategies for dealing with these. (e.g. if I really wanted to be tall, I could always wear high heels!).
But then you have to put together an action plan to ensure that you work out how you're going to achieve these things.
Otherwise, all you end up doing is whingeing about them.
I'm not saying that you're whingeing - but it sounds like your DP might be thinking that ...
Good luck, lots of {{{{{{hugs}}}}}}}}}} - and good on you both for going for counselling. I hope that it's productive for both of you.