I'm sorry to hear that. Try following these steps to resolve the issue:
Unplug the power adapter from your Fire TV Stick or from the wall outlet.
While the device is off, reset the Fire TV remote by pressing the Menu button, the Back button, and the left side of the navigation ring at the same time. Hold all of these buttons for 10 seconds. Note: This step will not factory reset the Fire TV Stick. It removes Fire TV settings from the remote.
Remove the batteries from the Fire TV remote and plug in the Fire TV Stick. Wait for the Home screen to appear.
Put the batteries back in the Fire TV remote and wait for one minute.
If the remote still hasn't paired, press and hold the Home button on the remote for 10 seconds.