I agree about feeling alone, its power, and how we can ruminate our thoughts faster than we can find something to do with ourselves. At the moment, I'm home, on my own, knowing I should be in bed, but somehow awake seeking someone to talk to. Here's what helps me some.
1) Always acknowledge that many others feel totally the way you do. Sometimes, that thought can make you feel less alone. Tell yourself "I'm with, and part of, so many others, right now".
2) Sing. Find some special songs, and try singing them for the heck of it. This activity makes being alone advantageous, rather than a downer, since only you can hear yourself. Don't be hard on yourself, but believe you can get better. I even reached the point I go public with karaoke without fear of embarassment. A journey, but well worth it. And unlimited songs to keep trying.
3) I got rid of the TV. Why? It is simply too stimulating to my aspie mind to enjoy it. My visual memory is too good. I don't know you, but ask yourself how much stimulation, could be too much or not enough, might make being alone more enjoyable.
4) Excercise. Try push ups or 'jackknives' for the abs to get endorphins flowing and improve mood.
5) Art is priceless, healing, and beautiful.
I feel better already, and I hope you do too. Knowing you may have helped someone feel better or improve themself, also helps.
Thanks.