Drooling and crying and just out of sorts. My son would not nap, for example. He wanted to nurse all the time, and did. I think it was about 3 months. They start with symptoms way before the teeth are ready to come in. There are many stages to teething.
I used homeopathic remedies that worked instantly. I took my son to a homeopath who prescribed a remedy and within a half hour or less my son was smiling and took a nap-- his first in days!!
You can get those Hylands teething tablets and gel at Jewel or Dominick's or pretty much anywhere. They are homeopathic but are a 'general' prescription for many types of teething problems. They really do work, though and you don't have to give Tylenol usually. I gave him Tylenol with his molars, though. Those REALLY hurt. You won't have that for another 10 months or so, though.
It very well could be teething and I would try some of the remedies below. Cold washcloth is great. Good luck, this too shall pass. :)