I do not know if CBD (cannabidiol) may be available from some pharmacies in one form or other as an over the counter Schedule 3 drug and suggest you find out exactly what your doctor means. Does he propose prescribing it, or have a particular other medication in mind.
There is not that much mention of it here on the Forum
You can try Googleing
CBD beyondblue forum
cannabidiol beyondblue forum
To see other's views.
Please let us know how you get on