I have the exact same problem - a lot of us does.

I dont have a solution but look up fear conditioning and fear-potentiated startle. Everyone is different but there must be a very strong psychological component (certainly in my case).

I hope the best for you.

Thank you Mark and Norwegian, your input has ad will be helpful for me in the future. I've tried to cut back much of my lifting and strenuous exercise to several weeks out from any symptoms, but struggle when the weather gets worse to do anything else. I had been playing golf more and walking to get exercise, but the lack of sunlight has put a halt on that. I've also done a lot of PT to ensure my neck stays stretched out and in the right spot while lifting. I wondered at one point if I'd need to see an ortho as I still get occasional needle like pain down my neck and trap from the initial concussion August 2014. Mark you are correct as I also do see many symptoms come on the day after lifting and not right after or that night even.

A challenge for you is to learn to lift without tensing your neck muscles. It can be done, especially at lighter weights.