First thing first let me just say,
I know what I'm feeling is unreasonable
I know my life is a lot easier compared to many
I know I'm lucky to have a supportive partner
To clarify - I don't want to be told I'm a bastard, I know I am I want to told how to stop!
DP and I have 3 children
DP works, I am a registered Carer for DS1 who has a chronic genetic disease (don't want to out myself!)
Ds3 is a year old - I have suffered with really bad PND since he was born and AND towards the end of a really difficult pregnancy where I was left wheelchair bound, in hospital in constant chronic pain, all my dignity stripped from me.
DP went back to work when ds3 was 4 months, he's a contractor and between us we decided he would work in our local town rather than the usual 3-4 hrs away.
He works long hours! he had deadlines to meet.
After a discussion about how hard I was still finding it he changed the hours to be 9-5.30 in the office, overtime is at home. This was a big change it meant I could rely on him to be in at certain times.
(My PND and anxiety is greatly worsened by lack of routine so we though this would help)
Now for the silly bit! 
I have always had a real problem with how different our lives are, DP gets fancy meals out ever day, friendly banter all day in a warm office etc etc, I get scrubbing toilets, laundry and nappies :(
DP is very successful In his chosen field of work and gets headhunted a lot. He earns well and I'm very grateful for how well he provides for us.
This is why I hate the resentment I feel, I hate that he's out having lovely meals when I'm at home unable to eat at all because DS is being troublesome.
I can't go out and work, I can't be reliable enough due to DS's medical stuff, I do a few bits of voluntary work at home but they always come last in the pecking order.
I can't shake the feeling of being DP's poor, simpleton add on that is just a small branch off of his fantastic career.
I want to stop feeling like this, he hasn't done anything wrong, it's all in my stupid, mind.
I do have a social life, I see a few people I feel fulfilled in that respect.
I don't know how to make it better but DP says he's feeling punished for having a job and he can sense the resentment, it's made me become I affectionate and distant. Whatever I try I can't kick it!
I haven't seen a GP about my problems, I've taken many years of fighting to be taken seriously by medical professionals who all seem to label me because I was in antidepressants years ago.
Does anyone have any coping strategies or tips?