Please help Social care financial assessment

Please can you help or advise. I have carers that help me each day which I have a care package for under adult social care. I have had this for roughly ten years and have never had to contribute financially, I have had my yearly financial assessment done and have received a letter stating I need to pay £400 a month towards my care from now on. My circumstances have not changed at all and I have been told it’s due to the limit they have on disability related expenses under their new guidelines. I’m absolutly worried sick as I have no way I can afford this and I have 4 children I’m a single mum and many debts and I’m now thinking I’m going to have to stop my care which is something I really need. I’m not sure who I can turn to for advice, please can you help at all or point me in the direction of a place that can help me or suggest what I can do many thanks