Warm milk and a (large) drop of whisky/rum
Lavender oil in a burner/in a bath/dried lavender under your pillow
Meditation of some sort, deep breathing exercises before you go to bed. Actually some yoga positions or stretching are/is very good.
But if all else fails, sleeping tabs for a week will help if you get really desparate. Could your Mum come and stay for a few days?