It must be alarming on bitcoins right now but keep in mind that it started from just a hundred dollars before i think youre late investing on it, you might invested when its already on top which give you less profit from it. This is not a panic time for bitcoin, it is still on high price why would you panic ?
Depends on what price you bought Bitcoin. If you bought Bitcoin for 18000 dollars, then probably you can panic. Have enough patience Bitcoin will still grow.