Rock bottom is a mental health issue unresolved, pre-existing and made worse by the substance use, or possibly even caused by substance use.
People who are "just addicts" wine and cry and bitch and complain they are alcoholics and what not- it may be true for some.
Mental health issues (bipolar, schizophrenia) is a far more complicated thing then just a drinking problem.
So Rock Bottom to me is mental health.