Hello, I am Kitt and I do not usually post here but your topic caught me eye. first of all welcome to HealingWell
Substance Abuse. Up to 60% of patients with bipolar disorder abuse alcohol and drugs at some point during their illness. Both diagnosis and treatment are difficult in such cases, since substance abuse is often a method of self-treatment, and withdrawal can produce symptoms of mania or severe depression. The effects of cocaine in a heavy user can also produce abnormal mood swings that closely resemble those of bipolar disorder.
I am so sorry to hear your MIL is having major problems and as a DIL she is lucky to have you as you obviously care for her to come here and advocate for her.
I wish her the best and for you big hugs.
Kitt