Anxiety/14/school/help!/?

Im really scared of school. Well not of school, just some of the lessons.I just feel really sick and anxious before i have them and i cant survive a full day at school. My mum wont let me see a councillor and i believe thats the only thing that will help me. We do have our SATS next week and my doctor said to wait until after them and if i still feel anxious then i have to go back. I also really dont like form. Tomorrow is going to be my first full day and i HAVE to stay there a whole day or ill get really told off by my parents. This morning i was crying and i actully felt SICK even before getting there and i just wanted to turn around and go home. Also the doctor said i should take up sport to get my mind off of it so any suggestions for a 14 year old lol. Im really worried that i will be sent to a mental hospital or something. And my mum doesnt believe in councillers so help please!!!!!!please read details under...../...