babypringle, i could have written this myself. Scary how similar our circumstances are, even and especially down to having to call DP home from work. I do still have my mother around, but i lost my father to cancer when DD was just eight weeks old, although i had already lost him to alzheimers long before, he never saw DD.
I had terrible anxiety about my health, my DD, everything. I also had a useless HV who basically told me i was suffering from clinical depression and i never saw her again
I was posting very similar to this last year and everyone was telling me to get along to the doctors. I held off for a few weeks then had a total meltdown. I was put onto ADs and it really turned things around for me. I just went through so much in a short time that when everything calmed down i lost it. The ADs saved my relationship, and probably my life. Im still on them and cant see me coming off them anytime soon. BUT all it is is popping a couple of pills in the morning, and i get to be me, i had forgotten who she was. Its not a miracle cure, but im not living scared. Ive had counselling, which, if i could have got more sessions would have been a great help im sure.
I think you need to find someone who you can talk to about this, another HV, another doctor, preferably a woman of similar age. You are entitled to counselling on the NHS although you dont get much, it will be a start.
I totally sympathise with you about your dad, when my father died i was relieved, relieved for him and relieved for myself. I wanted to return to my bubble of perfect family that i was adamant i had to have, i put myself under so much pressure to do this. It was like i wanted to pretend all that bad stuff didnt matter. It does matter, two years later and i am only just starting to realise, fuck, my dad is gone. Maybe if i could have had some counselling at the time i would have coped better.
The problem with trying to cope alone is that your body physically often wont let you, the happy chemicals in your brain stop working properly and that is why you often need the ADs to boost this, then you can deal with things. When you can only just about deal with getting up in the morning, dealing with the root issue aint gonna happen.
A GP would definately NOT thin you have left it too late. I was diagnosed with PND when DD was 2yo. Its a horrible diagnosis to get, it is scary and worrying, but once you can put it in its own little box, realise its an illness, you can move on.