The objective of dhikr and of the dhikr that you have just done is if you like, a loosening up or a shaking off of our ideas of who we are, of our chains. It is about re-orientating oneself to the Lord, to Allah.
The meaning and the significance of the hadra is that it is like a shaking loose. It is a shaking loose of the things that normally worry you. It is like letting go of the chains so that you can find out who the being is that is there beyond the chains.