This happened to me two weeks ago. Shot a worst round after a month of lessons and probably 50 hours of practice. Not to mention videos, articles, forums, etc.
Took a day off from golf and went back out there. Spent a whole hour just doing mini swings with no plan, expectations, or thoughts. Then I started full swings with the same mindset. Didn't even look to see the ball too much. Just getting a feel.
I just needed to clear my head. Played again 10 days later and took 22 strokes off. Just clear your head (easier said than done).