50 or 60 G's means your 8 pound head would feel like 400 to 480 pounds momentarily. Think of what the forces on your neck would feel like if they were supporting a 400 pound weight. So, when the other person's chest hit your head, you would have to felt like a 400 pound pull was against your head in the opposite direction.

If your neck easily resisted the contact with his chest, the forces were minimal.

Now, go get help with your view of life. It will help with your anxiety.

You will benefit from finding lots of tasks where you can be successful, no matter how complex or difficult they are.