It’s so hard. I’m sorry you’re going through this.
I can say time will help. And that is very true, but it doesn’t help you in this moment. But it’s something to think about.
Meditation helps. I was in such a bad place after a breakup. I had a constant feeling of panic and depression. I started to meditate. Guided meditations from online. I would seriously meditate for 1.5 or 2 hours every day, sometimes twice. It helped a little and it used up the time I would normally spend feeling miserable.
My attitude was to find ways to occupy my time so I couldn’t use that time letting my mind spin. I started saying “yes” anyone asked me to do something that would use up my time. I made some friends because of that, too.