the more days the bitcoin price slumps down, how do you think, whether the price will stabilize or it will keep falling down ,, seems like I'm getting scared 
It seems to me that you don't have the nerve to withstand the volatility of bitcoin. I can say that if your portfolio is going down, i would go to panic mode too, that is if i am a newbie in this trade. For veterans of this crypto thing would just say to you to relax and be calm if ever there is a dip because this is just a normal thing in the crypto world and everything will stabilize soon.