it takes time to overcome trauma and for years I was agitated ( bipolar doesn't help that ) but I can say last night after someone was unnecessarily rude to me and I decided to walk away and ignore them I cleaned house, drank a cup of tea, watched some comedy, went for a swim and slept like a log. I never thought I could ever relax like this, especially after something upsetting!
The secret is knowing when to be busy, when to slow down, and to be in the moment. That means being very aware of breathing, feelings, basics like hunger and tiredness and need for exercise.
Active relaxation is probably best for you right now, maybe starting snall.
Daily exercise is the number one practical way- two gentle ten minute walks can re-centre me beautifully, especially at dawn and dusk, the most powerful light of the day!
I end every day with a 30 minute swim, it means I don't need to medicate sleep either.