Ouch that's a big loss if you will compute the price and investment incurred now. Actually, you only loss big if you sell. I think just hold it. But if you have extra fund, just average the loss by buying at a very kow price. For me, I dont considered it loss when youre not yet trading it foe the price now. It will only become loss when you put a sell order on an exchange. Just relax and hold it. If you need the money then that's the problem you will really incurred loss. But before you invest, you should only invest money you dont need for living cause that will really put you in a criical situation.