When will it stop?

Life has changed alot since I have started my job. I am now teaching in a DeKalb County School. This will be my first full school year, since I started in January of this year. I am in 2nd grade and I am the department head of the Special Education Department. And I am doing the co-teaching model. This year has not gone well. I come in with a positive attitude in my mind and then it gets ruined. If you ever thought co-teaching was easy....it isn't! I have had co-teaching beat in my head since I was in undergraduate. And when you encounter someone that does not want to co-teach then it was very hard. I do not trust my co-teacher, and I don't know what else to do. I have gone to administration and we are supposed to have coaches from outside support groups helping us. I have not seen that yet. I am trying my best, but nothing is working. Lesson plans aren't followed, I am lost everyday I am in the room...which is all the time since my stuff is in the room. I pray and I ask God for help. Obviously, he has me here for a purpose and I am going through this for a purpose. I just don't know what it is. Then, as the situation continues it increases and keeps going on and then everything hits the fan and it is almost like you are the only one blame for everything happening and they are talking mostly to you. I have gone to administrators and they knew we were having trouble, and nothing was being fixed. So, everything has hit the fan and now I am down and I am not living up to the expectations that I need to as a teacher. And maybe I am not clear on my expectations and maybe administrators aren't clearly stating them. I don't know. But teaching is not as easy as it seems. With being sick and with having car issues and with being more focused on these issues between myself and my co-teacher, it is not helping anything in the world. Then I start to doubt and wonder if I am meant to be teacher? I know God called me to be a teacher and I know that thought is not an appropriate thought but it happens. All I can do is pray and ask for help and guidance.