Since i've no idea what that mean...should I have to worried for the fund that I kept on blockchain ?
No. Your safe. It's just that some group has taken it on themselves to launch a "stress test" to try overloading the network with spam transactions. They will be cleared out and the network will go back to normal eventually.
Yes, it will go back to normal "eventually"...but could take days or weeks with lag in the system. It is pretty serious situation. I am going to sell some of my BTC and buy back lower as this is certainly going to hurt the price in the next few days/weeks. We just had a big rebound and due for a pullback and this will push it off the cliff.