Children of Addicted Parents and People

ok so im 23, not really a child but i have an alcoholic mum and it affects me the same way it did 10 yrs ago if not more. my mum has currently relapsed, she has drank 1 litre of vodka every day 4 3 weeks now, she lives in a rough area and is socialising with others who are addicted to either drugs or alcohol.i suffer from depression and have an unhealthy relationship with my mum anyway,e.g role reversal.ive have time off work and have just been told my job is hanging by a thread because of my absence. not easy when i feel like im on call 24/7. only other family members are my nan 84 and step dad who reacts badly to mums drinking so im the main carer. i go to bed n have nightmares, i wake up n call my mum,relay the info to both my dad and nan n then go to work. make same calls after work n back to bed. my mum is suicidal often n does attempt it by overdosing so shes in and out of a and e. shes off work sick as been drinking at work and shes now physically addicted, i dont even think she can go through withdrawal without a detox now. my dads filing for divorce, my mums guna run out of cash and loose her home if she carries on, i just want it to end however bad the consequences are. i dont think ive got the strength to cut all ties as much as i know it would be the best thing for me due to my health,(depression,anxiety,self harm), if anything happens to her i will feel so much guilt! ive been told shes not my responsibilty but i act like she is,have done for 10 yrs and its a hard thing to change. my mum has had dry episodes of up to a year, this time shes relapsed and detoxed twice in 2 months,this is her 3rd relapse.it frustrates me no one can do anything, shes aware of gdas and AA but doesnt use them or use her g.p. i wish she could be locked up for a month,im sure theres other mental health problems there anyway but they cant assess her while shes drinking. absolute nightmare! people underestimate what families of alcoholics go through.my heart goes out to anyone in my shoes.