Here are a few possible explanations for the experience you described:
Psychological Tension or Stress: Squeezing all your thoughts into your mind and closing your eyes might be related to psychological tension or stress. The head shaking could be a physical manifestation of that tension or a way for your body to release built-up stress.
Psychosomatic Response: Sometimes, emotional or psychological stress can manifest physically in various ways, including involuntary movements like head shaking.
Energy Release or Catharsis: Some people may experience physical movements or shakiness when trying to release pent-up emotions or energy.
Tension Headache or Migraine: The head shaking could be a response to a headache or migraine, which might be triggered or worsened by stress or other factors.
Unintentional Body Movement: In some cases, head shaking could be an unintentional body movement related to neurological or muscular factors.
If you are experiencing head shaking or any other concerning symptoms, it's essential to consult with a medical professional or a mental health expert to rule out any underlying medical conditions or to explore potential psychological factors. They can provide a more accurate assessment and offer appropriate advice or treatment based on your specific situation.
Please remember that online information can only provide general insights and is not a substitute for professional medical or psychological advice. If you have health concerns, it's best to seek guidance from a qualified healthcare professional.