You're in a really difficult situation, inside and out
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What you need is someone to tell you that it's the PND that is making you feel despair, and it's tricking you into thinking that it's never going to get better, and nothing will ever help it change and it's all your fault.
I think this is what's missing at the moment, someone strong and knowledgeable to keep on telling you to trust them and keep you anchored in reality, outside the awfulness of PND which twists everything around.
I know it feels like you know the real truth, and others can't know how bad you are, how terrible things have been, and how final everything is. But it really is the PND speaking. It's an awful illness, it tricks you and it tinges everything with fear and gloom and despair.
And you need a way out. But not the one your illness is telling you to do. Please try and believe that although it feels like the only thing you can do, that it's wrong and acting on these feelings will end up hurting you even more. You need a way out that's about getting through the PND, not plunging you further into it.
When I'm depressed (& I do have it a lot on and off), I try and 'fake it till I make it'. I try and do what I know is the proper things to do, even if it feels pointless and hollow and just never going to work... But even though my heart feels frozen and terrified, I just keep plodding on.
I try and think, that if nothing will work that I've got nothing to lose by going through the motions... doing what I can until it does slowly have some effect, and I slowly feel a bit better, and hope creeps back.
How is your GP? Any good? Can you ask someone else to phone and run the gauntlet of the receptionist? Once you have an appointment, you can ask the GP direct to book you in for a follow up appointment so you don't have to deal with scary things at the mo.
Keep on listening to the advice in here, from people that have shared the same experiences as you 