Re: Could it be Teething?
It certainly could be teething or it could just be a phase. We went through something similar when my DD was around 6 months. Before things got crazy, she would nurse around 6pm, fall asleep and then remain asleep until around 4am. She would also nurse to sleep for naps and nap for about 2 hours. (Me holding her of course, but that is the only way that she would nap.) Anyway, all of a sudden she started going crazy at night. I would nurse her to sleep and the second I put her into the crib, she would go NUTS for about an hour, until she just wore herself out. (We couldn't calm her down either.) And she would get up 3-4x a night to eat. I don't have any definite answers, but here is what I think.
She would fuss constantly while nursing (and still does sometimes.) I try to keep her busy by playing music. I think that she is just SO interested in everything, so if I played music, she had something to focus on and would eat. The night craziness just stopped at around 6.5-7 months. We pushed her bedtime to 7pm and she stopped fussing. She also cut her night time feedings to 1-2x. For us I don't think that it was teething b/c she just got a tooth at 7.5 months.
Hopefully, it is just a phase and she will grow out of it. It sounds like you are doing great! Keep up the good work! Hang in there! I know once I feel like I am doing well, DD decides to change -- these kiddos like to keep us guessing!