What do I say to my dr?

I am absolutely terrified to call my GP (I’m in the UK). I have the support of a PND group which I attend (we are certain I have PND/PNA) and I haven’t been ready to call my dr, maybe because I didn’t want to admit it but also because I’m terrified of them taking my baby even though I know they won’t. I feel very much alone and I’m carrying an awful lot right now. My baby is 6 months old and I started feeling awful around the time she was 4 months so I’ve been feeling the same a good 2 months. My GP is so bad, I once called them in tears previously because of my mental health and the receptionist told me to “call back tomorrow” 🙃 so it’s really not helping my anxiety. Plus I just don’t know what to say? And I’m not talking about my symptoms, I mean how do I even start the call? “Hi please can I speak to the dr I think I have post natal depression?” What if the receptionist is a cowbag and either tells me to call back (even though I know I’m going to tell her it’s taken me months to pluck up the courage to call) I hate anxiety. 😥 do I say I’m depressed, I don’t even know!? I’m literally terrified!!! Another background to this surgery is once I called when my baby was young she had a bad rash and the receptionist was SO rude to me she was shouting at me telling me my baby was fine and had nappy rash. Like WHO is she to even assume and tell me that!?