How can I start again?

[Overrit3456]

I have name changed for this. It's a little long...

I am in complete and utter despair. I have never felt like this before and I don't even recognise myself.
I am almost 6 months pregnant, this is supposed to be my dream come true. Things have been made difficult by my DPs ex who has made contact with his children difficult because of the baby. I have put up with her outbursts, threats, emotional blackmail and outright campaign of fear for almost 3 years now. DP is obviously in bits about his kids, who he adores and is an amazing dad too. His ex has stayed in their beautiful home, he pays well over CMS and also pays half for extras like school trips, uniform, birthday and xmas.
We live in a rented home, get by on very little and most of our food is bought from the reduced to clear section. This is absolutely fine, I knew what I was getting into. I knew it would be a while before he financially stabilised again and respect that he takes such care of his responsibilities. It just makes her actions even harder to stomach.
It's the constant abuse, stress and fear she causes. How much constant stress is too much? I've reached serious breaking point. I can't bring myself to do anything, not shower, clean, walk the dogs. I'm not excited about the baby, just scared for the future. I haven't bought anything for the baby bar a few vests. I honestly just think about ways out constantly and there doesn't seem to be a way out anymore.
AIBU to want to run away and start again. I love my DP so much but I can't face what my life has become.

Talk to your midwife straight away. Don't wait fo next routine appointment. Your mental health is the priority here and it sound like you need help.
In the long term this situation has to be resolved. Can you give examples of how she is harassing you?

The threats and harassment are not specifically to me
She will threaten to kill herself if we go on holiday or do something nice with the kids. Same if he wont pay for something or give in to her demands.
She will stop him seeing the kids. He becomes upset and stressed, often then gives in to her.
The worst is a while back she threatened that she would accuse him of rape and promised to ruin his life. She sent a text saying this so I think she would never get away with it but I get terrified she has had a long time to plot if she doesn't get her own way.
She also once let herself into my house. I wasn't there and my dog barked a lot until she left, apparently.
DP wont act robustly as he is afraid of her stopping contact. He has seen so many people go months without seeing their kids and honestly that would kill him.
I get palpitations when her name is mentioned now. The accumulation of stress and now being pregnant I feel like my head is going to explode.

She sounds unhinged. Did he leave her?

How did she gain access to your home ?

Oh she is completely unhinged. Even within her family there is an acknowledgement of that but has everyone around her so afraid to confront her.
He did, but not for me, he left and financially crippled himself because he was so unhappy and fed up of her abuse- constantly being told she hated him and I think he genuinely thought she would be happy if he left. But she wasn't.
And now she is my problem too and I ignored that until it's too late and me and my poor baby are stuck with her having so much influence on our life. I just want out.

@MrsRufusdog789 this was early days, wasnt as cautious and back door was unlocked. DP was home and asleep after a night shift and I had just popped out