You would get a clearer answer if you specify the amount of bitcoin which are going to be sold. "Huge" can be anywhere from 1000BTC to 1MBTC. The former won't even move the market while the latter will likely result in a substantial drop on the price.
Waahh. Panic selling. It is really a bad habit and I tried it once when the value of bitcoin dumps into very small amount and jt really suck me because my money in my online wallet also falls down. But now ive learned that you need to wait for the right time that the price will come back.