I think you are being overly sensitive to minor issues that, if you ignore them, will resolve on their own. If you neck feels sore, you may have strained/stretched some muscles. A little warmth can help. But, such an injury would have no impact on your brain. The new glasses can feel different and anxiety can cause those minor differences to become a focus of your attention.

So, try to ignore them and move forward. By the end of the week, I doubt you will notice anything different.