I second browny - the doctor was a PIG, try and get an appointment with a female doctor if you can.
I have looked at your profile, that is a lovely HAPPY looking little boy - you clearly love him loads and its there for us all to see.
They wont tell social services at all my love, i promise you that. I suffered with horrendous post natal depression which incedentally wasn't diagnosed until DD was 2. I really lost the plot, I am on ADs and im having counselling. I self harmed, talked about suicide and was VERY strange! NOT once was social services mentioned, no one has EVER questioned my suitability as a mother (i was scared they might but they have not). I did speak to a social worker, on MY request in order to get access to decent counselling, but she wasn't a childrens social worker she worked in mental health. I am not sure in all of the time i have been seen by doctors and counsellors have they even asked how i cope with DD. I cope as well as the next mum, so thats well on some days, shit on others.
Obviously your immediate issues are with sorting out an abortion (if that is what you decide upon - i really think you need counselling regarding this, yes your doctor was a bastard but Marie stopes are better equipped to help you, he is just like a glorified receptionist and would point you to a specialist if you were ill, its much the same as he has done here). I think you need some help with your D?P?? What is the story with his job? Things are really tough just now and maybe he is finding things hard to deal with just now. Why did he tell you he doesn't want the baby - did he give a reason or was it said in temper? You need to know these things.
You feel you need some help with parenting? Well you know, the one thing in my life i am confident about is being a mum, im fucking good at it. BUT, i am going on a positive parenting course being offered at a local primary school, because DD is becomint really challenging and i am finding it difficult - I don't think im a bad mum, but i could do with a helping hand, There is no shame in asking for help.
Is there a local surestart or homestart near you - they are fantastic, i went to a homestart playgroup, i didn't even tell them abuot my depression, but the set up is so supportive, because being a mum is hard and this group is set up to support all mums, and dads! A cup of tea while someone else keeps an eye on the LOs kept me sane (ish!). They can offer so much more than that, volunteers who come to your house, just for a chat, or to help out etc.
You sound like you have so much on your plate just now and you cannot cope with this alone. Write it down, make your partner read it. IF he leaves you, he didn't love you in the first place - he is still there, i suspect he loves you and isn't going to leave. I too am terrified of my DP leaving me, but that is because I have self esteem issues and i suspect you do too.
You need to start being kind to yourself or you are going to break down - sorry to be blunt, but you need some help.