Girls, hi. We've been having tummy troubles for 5 months now. It start…

Girls, hi. We've been having tummy troubles for 5 months now. It started after eating 5 days ago. We've been taking enterosgel for two days now. It hasn't helped yet. Today she started being fussy. And everything in her mouth is just pulling straight down and biting my fingers really hard. Could it be teething? Please share if you know anything about this?