Quick question.
Have you ever bought the dip, but then the price breaks through the support and continues dropping deeper for weeks or months?

Well, I have done it before.
The problem may not be panicking but may be determining the actual dip before a pump.
Not every dip is worth buying
after all no one can predict what the market is going to do with complete accuracy so buying the dip still has some risks associated with it, still I think it is a good strategy, however it is one that requires a constant influx of capital to your fiat accounts so in the case the dip keeps getting larger you still have some capital available to buy the next dip.
@ Silberman, this is exactly the manner to lose all your money if you are regarding this to trade. Dip for trading has no limit because as @Bitcoin_Arena said you can buy in dip and it keeps dropping , if you keep going in you keep losing. So for a trader in such case is to stay out from the market at that period if you don't understand the market. And for a hodler, there is no need for panic hodl and it will recover soon.