That moment when you buy 1BTC at $2500, and then 3 days later someone buys it at $2000. But I'm guessing that it's the risk involved in investing, so what do I do now? Sell? Or hold on them?
Best thing you can do as of now is just hold it to yourself and wait for another price spike or something. Nothing good ever comes out from selling immediately with losses. Don't ever panic sell. Just hold on to with whatever you have and probably search for plausible trades other than bitcoins.