Yesterday I was doing overhead press for 3x8 at 30 kilos. I felt a slight pain/tightness towards the back left side of my neck and today it's quite a bit worse. Nothing unbearable, but I can't tilt my head to the back left. I don't think I'm ego lifting but this has happened once before. Any tips for a faster recovery and what I can do to prevent it in the future?

Also, weirdly enough the pain is on the left side and it hurts when I tilt my head left, so when that muscle contracts. I would have expected it to hurt when stretched, no?