It’s unlikely that PMS is her problem. It seems more likely that drinking is her problem. Whether or not she has a disorder is not something that I could determine over the Internet. She would need to have an in-person evaluation, to know if a mental health disorder is present.
Family members, who have a loved one with a drinking problem, often utilize a program (in the United States) called Al-Anon. These are group meetings for friends and family members who have problem drinkers in their family. They provide great support to families in situations like yours. I don’t know if you have this type of program in your country, but if so, try to utilize this resource.
Sometimes families stage an intervention, which essentially means that they plan a meeting where they ask their loved one to seek help or face a set of consequences. You can read more about interventions online. Ideally, you should consult a professional who specializes in substance abuse or a trained interventionist for guidance.
Alcoholism affects the whole family. If your mother is unwilling to seek help, then you and your family members should consider individual counseling. It will assist you in dealing with your mother’s drinking. You can also learn about self-care which is important for your own mental health. Please take care.
Dr. Kristina Randle