You’ve been trying to deal with this for 5 years?
That’s a long, long time to not feel safe. This can’t go on. It’s not safe for you or your Mum.
This horrible situation is absolutely not your fault in any way.
It sounds as though your Mum has an alcohol addiction to me. It’s an illness. She will say and do things which are not normal for her when she is drunk, including being abusive to you. And she can’t stop drinking.
You can’t help your Mum, she has an illness which needs professional help. You really need help too.
Go and talk to an adult you really trust if you there is one. A relative or friend, a tutor, pastoral worker at school or college or a social worker if you have one. Do it soon.
You don’t say how old you are. If you’re under 18 and there’s no-one else to talk to, please call Childline on 0800 111 or contact them online. They are open 24/7, but you can speak for longer in the daytime.
Childline:
https://www.childline.org.uk/get-support/contacting-childline/Information on parents and alcohol:
https://www.childline.org.uk/info-advice/home-families/family-relationships/parents-alcohol/If over 18, could you talk to a trusted adult? Relative or friend, college nurse, pastoral services, social worker or your GP?
Phone 999 if you’re ever in an emergency situation.