K.P.
I agree with Molly, he might just have tummy issues, which then you should give him some gas drops, they work great and no side affects. If you do think he is teething, which it is possible, try Hylands teething gel. Its homeopathic, no side effects, and it doesnt numb, it just makes them feel better.
Have you felt around his mouth and are his gums swollen, any sharpness? If so then yes he is probably teething.