Teething baby

Oh man my son is going to be 3 months on the 13th and he has been very fussy now he isn't a very fussy baby and for him to fuss this much was a surprise to me. He refuses his bottles from time to time he began to drool a lot and occasionally his temperature will rise not over 100.4 but almost there. The other day I was cleaning his gums and noticed he was biting down on my finger a lot and he didn't want me to move it he just sat there biting it for a good while. I took out some of his teething rings but he's to small to hold it on his own still any ideas on what I should do for him?