It's so hard to believe it now, things get so much better regardless of the outcome of the R. I know you know it too. You and I have been on very very similar paths and have discussed the eerie similarities at times. I am still recovering as well and everyday is different. You can do this. I know you can.
If you're all my ex lived with me for 3-4 months after b-day and some days she was a super blank. Others very similar to how yours is now. Filled with fear and potential regret. To the point when leaving me for OM flat out asked if I would still be there for her if things don't work out for her.
It gets better, being fresh it still hurts, everything takes time buddy. Be the best you for you
The person that you will spend the most time with in your life is yourself, so make yourself as interesting as possible.