I am sure you are not the only one considering this right now.
Today, no doubt, is a terrible day. Everything I followed today went the opposite way and I am down a chunk. But I think that it is important to keep some perspective. Everyone has draw downs in their accounts and you must be psychologically ready for that.
What you have to ask yourself is; "How bad do I want this".
If you really enjoy this and you see yourself doing this for the rest of your life, you must be willing to take some blows.
If, on the other hand, this is just a hobby for you, find a cheaper hobby.
The best way I can describe what I mean is that scene from that movie 'An Officer and a Gentleman'.
When Richard Gere's drill sergeant is trying to break him and in the end he asks him; "why don't you just quit!".
He replies "I have nowhere else to go". (or something like that)
You must want it or need it that badly.
Good luck