Just like what the others said, spending when the price dropped would only lead to profit loss. So instead of selling or spending the bitcoins you've hold why not buy more of it? Buy more when the proce decreased and continue to hold it until it satisfies you.
I experienced this before and I totally regret that it lead me to profit loss. I don't know before that bitcoin does have a big potential that it will grow and if you will not be aware of it and you are deciding too quick without thinking, you'll putting yourself in a such a hurry and lately you will regret that move.