I bet it's teeth. Joey's been getting random fevers and lots of snot and drool for a few days at a time for MONTHS. But when I brush his teeth he gets upset when I touch his gums and the ped said he's working on a set of molars and 5 or 6 other teeth. He got 6 teeth at 6 months old and nothing since. I wish the dang things would pop through already!
Teeth suck. I hope Lincoln is feeling better soon!