Sure there's worry. I give us about a 70% chance of winning this game, so most of the time things will go fine, but that other 30% is pretty damn scary. If we lose, the division title is all but dead to us and suddenly the wildcard will get a lot more precarious too. That, and beyond the bad reaction that will be totally warranted, people here will overreact also and start spewing lines such as "season is over, we don't deserve the playoffs" as if such irrational emotional swings from week to week are actually a good idea to submit to. (Note: if you make the playoffs, you deserve it in over 99% of cases. This isn't the BCS.)
When you get this invested it's hard not to worry about the downside. This Buffalo team can absolutely gash us on the ground, and I fear them scoring more than we'd like. I just hope that our offense is up to playing a great game today.