Lost 300 BTC by "investing" in BTCST ....... 
300 Bitcoins?
Who told you to put all your eggs in one basket? This mostly happens when people don't think before investing somewhere or when they get greedy to earn a lot of money at once and in that hurry they just do it without any research or something about that source they are investing with.300 btc, there's only about 25% of total bitcoin users that have near that much, and I don't think you invested all of your coins so you probably have some still left.