yes it is profitable, but also VERY competitive.
A word of warning though, it is important to brand yourself and build a reputation in Internet Marketing, as you already know.....
BUT, do NOT be tempted by the seduction of money and profits by branding yourself as a false MEDICAL EXPERT or Consultant / counsellor in such matters.
WHY? because if you were to become a snake oil salesman, Karma will bite you on the ass, big time,
whether it is by legal claims or whatever, by giving out unprofessional information etc...
I see many people do it in the Health and related niches, and some are just awful...
do not join them!
Instead, build up something unique, like for example, have a membership site with an interactive worksheet / program / plan of recovery
etc.. where members of your site only get access to the next level by completing the previous level successfully...
and so on. You get the idea
Think outside the box, but do it HONESTY and
with empathy to those affected by anxiety, sadness or depression,
and
you will be a success.
Good Luck