I definitely sympathize. Last November was a really terrible time for me, but the writing actually helped a lot - I was having terrible panic attacks and not leaving the flat, so having a distraction was lovely.

I definitely agree with the above commenters who mentioned skipping scenes. I left out an entire week near the start of my novel because of plot holes, and just proceeded as though it wouldn't matter, and everything worked out in the end. :) Another suggestion is to take a brief break and write something else to just get back into the spirit of writing. (For instance, I wrote two scenes set before the actual novel about the MC's love interest, just for background, when I was stumped and anxious with the main story.)

Best of luck to you.