Is it all unrelated? Not a doctor, and don't know your entire history, so I can't say YES or NO.

What I can tell you, is I have suffered from (and still am) the same thing.

From my understanding of myself, and what my doctor has told me, when I have a panic attack, my mind become "unattached" because of the chemical releases in my body. Fight or Flight response is what it's called. When I would have a panic attack, my body, thinking it needed to "fight" released adrenaline into my blood. This caused me to feel "unattached".. or Depersonalized... I would also have tingling in my biceps, and numbness in my hands. My heart would race, I would be taking deep breaths, and everything would slow down.

Basically, my body was getting ready for a grueling 10 round fight, that wasn't going to happen. That is my guess, as to what happened to you. Your mind was in a state of panic and your body was preparing itself.

Do you think, that the headache, was the trigger? I only ask, because I have had headaches... that mixed with me being a hypochondriac, caused my mind to race, thinking I was dieing of a brain tumor... body starts preparing, blood flow is increased... and there I am, thinking I'm either dieing or going crazy....

headaches, can also be caused by anxiety and stress... so, to me.. everything is all related. Kind of a "cause and effect" relationship your body is going though. Hope this helps... fell better...