It's a funny thing, how hard something can be - how difficult to imagine doing, all the fears building up - blocking you from moving forward even though you suspect you need to go there. And somehow, when you do get there - it's like a watershed. Most, if not all, the fear suddenly dissipates - you've moved on, even if just a little bit - asked for help and found someone ready to support you - which means you must be human and normal (!) and ready to move forward bit by bit..
I would strongly second all those that are encouraging you to speak to a midwife/ GP. I get from your posts that a key blocker is how you feel about the situation you're in/ your absolute frustration with yourself. I wonder if you re-framed how you look at yourself and your issues you would be able to drop some of the negative emotions undermining your efforts.
eg:
Everyone gets to points where they have a number of issues building up they want to address. - You're normal.
When you have a lot of issues built up - they can easily become overwhelming. - That's normal - but a challenge.
With a toddler and late pregnancy you've got hormones, exhaustion and distraction galore to also deal with. - Really adds to the challenge.
You've identified you're feeling overwhelmed, suspect you're in a bit of denial/ thinking you should be able to sort everything when you're struggling. - That's perception.
You've agreed to set out the issues and identified people you might want to speak to to get help. - That's a plan.
You could continue to think of yourself as a muppet, not able to pull yourself together and do everything even as you feel everything close in around you.. Or you could accept that at least some of the context you're in is completely normal - and a very genuine challenge to most people; you've begun to identify what's holding you back; are ready to break it down a bit so you can begin to get help about how to address each issue; and even though you're shaking in your boots - you're going to keep thinking about how to make contact with those that can help.
That sounds to me like someone who might have a real mountain to climb - but despite fear clouding in - is continuing to be constructive, forward looking and brave.
If you can't write everything in detail - set out bullet points. See if you can prioritise the ones the affect you most, how they make you feel, any actions you think you need to take/ need someone else to take and importantly - where you want to get to on each issue - including how you want to feel about it/ what you want that issue to look like.
You can do it - even though it is hard. Just take one baby step at a time and possibly try and see yourself as someone doing a job/ getting things sorted - so you don't overpersonalise/ start judging yourself overly harshly. You just want to feel better / make things better for yourself. Everyone has some road to climb - at the moment this is yours. I don't think you would judge someone harshly for the same struggle would you?
good luck, 100x