I say go to ER. Better now than if it gets worse and you REALLY should have been there.

old adages:

better safe than sorry
no time like the present
a bird in the hand is worth two in the bush
keep on keeping on
onward Christian soldiers (in honor of the season...)
sock it to me

I have run out of stupid things to say. But let me reiterate, I say go to the ER.