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 
Well, be patient, mate.
Nothing's more important than life anyway.
Besides, you are investing that huge amount of money to ETH, which I believe will be rising in near future.
You might want to laugh at this post when you finally make huge profit in the future.
Wish you best of luck!