I have a three and a half month old. Shes been super fussy and crying all day long. There's been short periods where she isn't crying. She has barely eaten today. When she wakes from sleeping she cries. Also, sometimes it seems like the only thing that gets her to stop crying would be pacing the floor. I believe she's teething since she's been chewing on her hands and drooling. Could her behavior be from teething or something else wrong? Help, I'm exhausted and have been up since six.