I agree when my mind was idle that is when I was the loniest its the night time that was VERY hard for me. Your just used to being with someone. It takes alot of time but it does get easier. I agree with the 3*5 cards write some things down. Start journaling your feelings get them all out. Find old friends and make dinner plans or just talk on the phone. I had a friend that I really didnt talk to for years but I know a phone call with her would be minimum 2hrs shes a talker. So I called her to occupy my time and by the time I got off the phone I was exhausted and just want to go to sleep hey it helped! I wasnt lonley for those 2hrs and I wasnt thinking about him.