Melatonin will help you sleep. Also self nurturing. Do the things that help you unwind.
You will drive yourself crazy thinking about what she is doing. I know it's near impossible to totally distract yourself at this point. Give yourself permission to think about it say in the morning for an hour or so and then force yourself not to go there the rest of the day. When your mind wanders back tell yourself I can go there tomorrow at 10 am for now I have to shut it out. Otherwise you will dwell and become obsessed it will drive you crazy.
Me 52 H 44 T9 M 5 BD 12/11 H split 8/12 OW moved in 12/12 OW gone for good 6/14 We get closer again 9/14 SD 13 Me 4 Grown
Accept what is...let go of what was and have faith in what will be.