Hi, It sounds that its not only the fact of being alone that is difficult, but that you are going through changes. You were used to a certain way of viewing life and maybe youself as part of that life, and this changed. It usually will take time to figure what do you want now. Long term there probably are no tricks to this, as there are no tricks to building a house. You just put them bricks one after another, see if they fit. But you are in control of this, and in some ways it may be exciting.

In practical terms: (a) Give yourself time to figure what you want to do now. You are in no hurry. (b) Talking to a psychologist may help a lot. If you think talking to a psychologist is wierd, know that at least most psychologists talk to a (another|) psychologist regularly. (c) Exercise is good. If you are not into it, start slow. Walking, situps in the morning, a few pushups. Do it because its something that is generally good for most people, and now you have the opportunity to build that habit. Not because its a trick or distraction. Also, you don't need a gym for this, but if you go to a gym, you'll be around other people. You wouldn't need to interact with them, but you might. (d) There are hobbies that are quite social. Theatre classes, Karate or BJJ, writing workshops or photography classes. Depends on what you're into.

Enjoy