I am sorry for the OP, but he acted stupidly. Selling at 150 would have allowed him to buy back at 100, then sell at 130
and buy back at 70, resulting in a doubling of his coins. OP, if you aren't willing to take a small loss in order to avoid a greater
loss and create the premises for a future win, you'll just have to wait until BTC grows enough to make a profit.
You must be a billionaire by now by using this tactic, you're a genius so damn smart.
Bitcoin isn't a stock, and should not be used to make a quick buck, the number 1 thing to understand if you use bitcoin to trade like stock, or any stock for that matter is... It doesn't matter if you buy at $500 and its worth $100, you didn't lose $400 per, unless you sell it. Unless the company, or bitcoin in this case goes bankrupt, or becomes obsolete, it will only go up in time.