I just looked at a graph from Real Clear Politics website, and since April, Hillary has been steadily going down hill -- with some increases and decreases -- and Trump has been steadily climbing up hill to the point where now they are completely tied in the polls.
If that ain't grounds for panicking I don't know what is.
This is the first election I've followed with any interest, so I'm not used to any precedents set in the past. This is pretty nerve-wracking for me.
Trends do not continue infinitely into the future.