I invested half of my saving ($25,000) into ETH when it was $725. ETH has now plunged to $459. I am very worried I will keep losing money and I fear for the worst. I want to go kill myself 
So unlucky for you that you didn't know the basic in trading. You must know that buying investments during their all time high has bigger chance of loosing profit. If you want to invest, make sure that its bearish that all prices are very low. Because once recovery hit, you can make your investments double. You must know the basic and the market cycle first thing before you enter trading.