That is a very very normal thing for a currency like bitcoin and I am not worried at all.

The recent price increase happened due to the chinese intervention. They wanted to send money outside country due to the falling price of yuan and instead of using regulated way of sending money, they chose bitcoin. Due to high buying orders, the price went up.

Now they are selling their bitcoins and the price has gone down. These are quite natural for any exchange traded currency. You should hold your bitcoin for price increase but you should think about long term. Shorter terms will not give you any good profit.