Is there anyway to get around this situation?

I'm currently 17 and I am diabetic. I have type 1 diabetes. I have done for 10 years next week. I have been receiving DLA (disability living allowance) for this time, and my mum has been receiving carers allowance. My mum works at a school and her boyfriend works at a airport. I'm currently at college d trying to get a part time job. We recently received a letter saying that our money is being stopped as I no longer need it. (we are now losing over �400 a month) We are finding ways to save money but it is impossible to save an extra �400 a month. We are a very low income family and without this money we can not afford to buy food. with me being diabetic I need to eat and have money incase my sugar levels fall low and need food. We can make an appeal to the DLA but it is pointless as not evn my tutor's hhusband has been given his money (he is wheelchair bound). Is there anything I can do?