yes there has been a huge fluctuation in the market of bitcoin, but now if you check out July 2018. It has been really stable. There can be a bubble, but who knows when will it burst.
It's true I was so happy with bitcoin my money was increasing day by day then
I thought it will increase more most of the predictors said it will reach up to 50,000$ per BTC.
But it never happened and i realized that listening to speculators is the worst thing you can do.