my daughter has turned into a cry baby!!!

Patricia
My baby is 6months old and she's never been a cry baby to just cry about anything! Well the past 3weeks she's turned into the biggest cry baby ever, she never used to have problems going to bed and now she will fight it and even wake up at night tossing and turning and crying she don't like to be in her swing, play pen, bouncer the floor anything! She just wants to be held but she still crys could she be teething? Not sure what else is the matter with my child it gets to the point where I get really frustrated and just have to walk away for a bit. She crys like she's being smacked and throws the biggest fit ever.