To be honest I am not sure what make price go this fast up. With hard fork and SegWit2x coming I expected for price to go down, but I guess it is still early for that. Yes it is good feeling when you know that your money is growing, and you are just sitting and watching. Answer to your question is rather simple one. If you need that money for something important in this moment, than sell your Bitcoins or just amount that you need. If not, than hold them. There will be drop in price, that is for sure, but after that it is expected for price to go even higher. Final decision is on you, and you alone. Good luck.