Great to hear that things are improving and that there seems to be support in place. Whilst I often complain about the lack of support from so-called 'support services' in universities (HR is currently in my sights), I have been impressed by Occupational Health at all the universities where I have worked, either in relation to my own illness at former U, or in dealing with friends/staff whose cases I am aware of.
My experience is very similar. HR is full of vindictive sh!ts, in my view. However, Oc Health really do seem to be most interested in the individual, rather than protecting the institution. They've offered me regular support from the University's own psychiatric nurse, which will be particularly useful as the nurse provided by the NHS is currently off sick.