But few days ago the price of bitcoin keeps flactuating. But i think it will go up pretty soon. But im surprise that the price of bitcoin keeps falling and i dont know why! I do expect a lot because of the halving but my expectation wasnt reach by the bitcoin halving 
Just go with the current flow and don't mind the worst case scenario. Price fluctuation that happens in bitcoin is a normal event. If you are just going to regret because your expectations didn't meet, it will just wrecked you.
Bitcoin price always fluctuates since the beginning so no reason to have a buttheart unless you didn't get out in the position when there is a sudden decrease.