I know everyone works differently, so I'll describe the way I've gotten through awaiting the results of a Big 5 acquisitions meeting (NO CLUE when it's happening). I forced myself to write, but not just write aimlessly, write with self-imposed internal deadlines.
We found out about the acquistions meeting in December but we were told that the imprint probably wouldn't do anything until 2017. So during that time, I was working on a first draft of a WIP, and I knew my agent was going to get me notes on MS #2 soon. I told myself that my goal was to finish the first draft of the WIP by 2017 so I could start on revising MS #2. In 2017, we heard that the editor was preparing materials to circulate and it would be added to an upcoming acquisitions meeting "soon".
In my head, I just had to pretend that it wasn't happening. I told myself that instead, I was going to get through my agent's notes by the end of February, so that was where I could focus my energies.
I still have a ton of acquisition anxiety and I check my email way too often. But those hours when I am focused on MS #2, I'm falling in love with another set of characters and another world, so it's easy to let the current sub simmer, at least for a little bit. Plus the pressure to meet your own internal deadlines really helped me from wasting TOO much time on Twitter.
Give it a try if you're really struggling, though I know deadlines aren't necessarily what works for everyone.
