I can deeply appreciate how much you want to help your mum, but there is a greater reality that must be faced. Your mum suffers from a severe mental illness that has hijacked her sensibilities. As much as you love her, this is not the job a 22-year-old individual — or any one individual — could manage. You mum needs help you can’t give her.
Your mum has not changed because she isn’t working toward change. There isn’t a treatment program to help her and one doctor, no matter how good he or she is, isn’t going to do much to help a delusional, aggressive adult.
The work for you now is to use the legal and psychological services available to get your mother help. Your anxiety and fear for your own well-being aren’t likely to change until she is living elsewhere. I would get a legal opinion about getting protection from her and acquaint yourself with what psychological services are available for her. Her moving in with you isn’t working and is very likely to keep getting worse. The kind of skills it takes to help your mom typically include many people. You may want to help, but having her live with you isn’t the way.
While it may be a difficult decision to make, your own mental and physical health is at stake. If you haven’t found a therapist I’d highly recommend you find someone for emotional support as you go through the process of living on your own. With your mother there you’ll prevent your own growth, which doesn’t help anyone.
Wishing you patience and peace,
Proof Positive Blog @ PsychCentral