I know exactly how you feel. My best friend moved a few weeks ago and I've been lost without her. She said that I can text her any time, but I often feel like a bother, especially when it takes her a while to respond (for the record, I always feel like a burden to others which is why I usually never ask for help with anything). I'm getting better and haven't talked directly with her for a couple of days (still "liked" some things of hers on Facebook) and it's killing me.