I'm glad you've started another thread "Hushabye*.
Here is a list of things I did that helped when I was at your stage in no particular order.
Phone friends.
Have coffee with friends.
Phone the Samaritans. This worked one night when I just had to talk to someone at 3 in the morning or I would have gone mad. They were brilliant and I slept like a log afterwards.
Start going to a yoga class. Choose carefully, you want one with plenty of meditation. It was my calmest night of the week and I always slept well afterwards.
Go for counselling.
Go for hypnotherapy (fantastic for starting to sleep again),
Have a day out or meal out with your family. (I wont say more but remember what you said from previous thread.)
Go to the gym. I found this great in the evening when I needed to just do something and always felt better afterwards.
Make a plan to do something nice and different to what you did with STBX. What have you never done because he didnt want to? For me this was skiing and visiting friends he didnt like.
Finally, on a really bad day, I used to say to myself Tomorrow Will Be Better and it often was.
You will be ok. Really you will. It just takes time. Go slowly. Be kind to yourself. 