Regarding the counselling you might get at worship centres, do be careful. They might be free of charge, but often they're not worth anything anyway. I'm not being anti religious here, I'm a devoted Christian, but having been "exorcised" I can tell you that some of the advice doled out is dodgy to say the least.

I would suggest going through your school. You must have a school nurse... that would be my first point of contact.

I really hope you realise that if you hang on for a few more years things will get better... it will be within your power to contact your Dad, you won't have to keep going through your Mum. I'm sorry she's been so unreasonable. Just hang on in there.