Hi
I'm so sorry this happened to you. It's not your fault.
This is almost identical to what happened to me in January. It might not feel like it now, but you will get through this. One day soon, the scales will fall from your eyes, and you will see the gaslighting, coercion and manipulation in all its pathetic glory. But to get to that point, you need to get safely out of this situation as soon as possible. You are not safe right now, and he absolutely will not leave of his own volition. If he had any intention of doing that, he would have left already.
You have to treat this situation as if your house is on fire, or as if you are in a war zone and a bomb could fall on your house at any moment - get out as soon as you can, anything like tenancies, notice period etc can be sorted later. Contact Women's Aid as soon as you can - I mean literally as soon as you can. They'll help you formulate a safety plan to get you out. Do you have any neighbours that you trust? I stowed my children's documents (passports etc), a change of clothes, and some cash at my neighbours house. We had to run in the middle of the night, and it helped immeasurably not just practically, but also to know that there was someone who was aware of what was happening. There also an app that I had called Holly Guard, that sent a message to my emergency contacts if I shook my phone. If you can't keep your phone in your hand, try and make sure it's in your pocket all the time.
Once you're out and safe, try and instruct a solicitor ASAP, and they can get an interdict against harassment and abuse in place. Mine got the Power of Arrest attached, which means that if he comes anywhere near me, he'll be arrested immediately. I'm in Scotland, so it might be slightly different elsewhere in the UK, but it should be similar.
The one thing I would stress is that it's very hard to understand the level of danger you are in right now. I constantly thought I was overreacting, that I was making a fuss, until I needed to run with my children. You won't necessarily understand the level of threat you're in until long after you're safe - your body and mind have gone into survival mode, they don’t have the ability to process that just now, so you need to act as if you and your child's lives are in danger.
The physical symptoms (shortness of breath, hesrt palpitations) are signs of trauma. You need to put them to one side, and focus all your energy on getting out of that house. They won't even start to get better until you are safe.
I'm really sorry to frighten you, but you are in immediate danger, and you need to get out as soon as you can.
Wishing you all the luck in the world - you are brave, you are strong and you can do this.