I know how you feel.
Earlier today, my heart just wasn't in it. My friends had just departed, the silence got deafening, the headache wouldn't go away and I was just really, really agitated. I'm a solitary drinker, so a situation that isn't too bad for other people can be troublesome situation for me, if I let it develop into one.
When I feel like that, or contemplate the act of running out to pick up alcohol, I try to remember phrases like, 'this too shall pass', or The Serenity Prayer, and I come here. I try not to over-intellectualize. I call or text my loved ones, and I tell them I am having a hard time, that I'm doing my best not to give up, and for them to please not give up on me. (I worry sometimes that they are going to tire of this, but I hope not.)
It's hard, I know. I don't know how to make it a pleasant ordeal, I just look for distractions that help rather than hurt.