Teething!!! HELP

Jade

My 4 1/2 month old has officially started teething. He's been so cranky the past couple days and lastnight was so horrible. I ended up sleeping on the couch with him on my chest so we could get some sleep. He's been having diarrhea and it seems to be kinda hard for him to poop. He's been arching his back in pain. Tylenol doesn't seem to be doing much