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
If it was savings I am assuming it isn't money you have an immediate need for anyway. Just have some patience. I am sure if the money was tied up in a low interest rate bank account (maybe 2% APR if you are real lucky) you won't be logging into the bank's website everyday obsessing over the change in interest rate or why you earned a few cents in interest, would you?
Like your opening words said, you "invested", so now you need to do what all investors do, sit back and have some patience. I know it isn't easy knowing your paper losses seem to be mounting, but keep in mind that is all they are at this point, paper losses. Nothing changes your initial investment ideas and goals unless, and until, you sell. If you sell now you guarantee yourself a loss.
My advice would be to quit looking at the price charts for a few months, as I do think we will go lower yet. But I also believe that within 12-24 months your investment will be back in the green and maybe for a lot more than you expect.
This is not a lot different than the bitcoin crash in 2014 when it went from a high (at the time) of $1200 or so all the way down to almost $100 again. A lot of people who bought at or near the high were selling under $200 just to "get out with something" as the gloom and doomsters were out in full force proclaiming the end. The thing people selling didn't realize at the time, is that those pushing the gloom and doom the hardest, were the very same ones scooping up the cheap bitcoin for sub $200 prices. The same thing is happening now, but I think we still have more down to go.
You may think you could sell now and buy lower, which might be good advice, but since it is hard to pick the bottom there would also be the chance of it making a rapid recovery and you losing out even more. However, if you really are feeling that terrible, it might be best to take the loss and just move on.
In the end it is up to you to decide, but no matter what happens it is just money. That may be painful to read, but you need to realize life truly is about more than money and learn to quit obsessing over it and go enjoy things that do make you happy.