Some Explanation Please

[Paan]

I was sitting meditation and suddenly wierd things started to happen that i want to have some explanation of. 

First it was like some force wanted to spin my head, then my heartrate got up and my head got warm. After that this "force" wanted to spin my whole body. After that i felt it in my lower back and spine. I cant really explain it and my english isnt the greastest.

I didnt get any further cause I had some resistence to the experience.

Does anyone know what im talking about or what it could be? Ive never had it like this intense before.