I'm sorry you're having such a tough time op :(
Good on you for walking away from that horrible bully.
It sounds to me like you're still shaking off the trauma bond. It's that that I find leaves you in the most brain fog and rawness. You've stepped of a rollercoaster that was dependent on his mood and your body is unsure how to deal so it's still giving you highs and lows but without why framework. Or course that's going to feel destabilising.
Firstly and most importantly, make sure he is blocked on everything (and change the locksif relevant) If there are matters like housing to resolve, do so through a solicitor. There is no further reason for you to talk to him. Secondly, get a new phone and step away from social media. Alternatively, do not accept friend requests from anyone unknown or unknown number calls.
Now, the emotional side. Firstly you need to relearn practing self care. Now ATM your mind is too busy for quiet things like meditations or yogas. So, focus instead on things like - running or dancing to music. Whenever you feel that huge surge of feelings coming in, Chanel it into dancing around your kitchen to something you can sing it scream along to.
Whenever you feel that feeling setting in of self criticism, upset or rage - go run or dance or something to get your endorphins going. Even just a sing along to a big old power ballad can help though.
When you're just feeling a bit down and less...extreme. TV, short comedy episodes can help too. Things that require focus in short blasts. The old school UK ones I'd say. Just something to give you a short blast of laughter and catch any spirals before they start.
Going out for a bit of air and (I know, hippy dippy but) if possible, putting your bare feet in some grass or splashing an a puddle can help ground you and make you feel thankful for living and, the little things, like...you know ..towels xD
You will get through this op. The length of the trauma bond varies. Often depending on how long you were together, how extreme the abuse and how well you keep no contact. But it's important to find a sense of self again.
I also would recommend, seen as you have being down on yourself...writing yourself a letter with everything you love about yourself. Or looking in the mirror ever day and telling yourself something you like about you. Can I recommend 'I like that I decided to stand up for myself after such a tough few years, I am strong and I am brave and I trust you now to protect me'.