Spend these next few weeks with family and friends. Don't let the uncertainty stress you out and ruin the holidays.
There is very little chance of any major change happening this year, or even in the first quarter of 2020. I can't imagine any major actions while the potential merge is being considered.
If you are off this time of year, it can't hurt to polish the resume and maybe even put out some feelers. The economy is generally good, there are many jobs in many segments, so there's little reason to jump ship now if you are happy with your job and benefit package.