work and HR processesy

Hi,

I've worked as a nurse at a public hospital for 30 Years. Struggling with treatment resistant depression the last couple of years. Motivation finally improving but not coping well at work. Have a supportive, but junior manager who has made some temporary accommodations for me but management are saying to continue to do so would be unfair on the other staff and I'm supposed to be finding a position "more suitable". I applied recently for a job in a less challenging area of the hospital but was unsuccessful. A very stressful situation at work last week resulted in a worsening of my condition and I'm now taking some (more) sick leave. My question is, do I now ask for a formal HR process to assist ("manage" me)? I havent done so untill now as my psychiatrist advised strongly me against it, saying they would "F*&*k me up", deliberately put me in a position I hate in order to get rid of me. I know this does happen. His advice was to actively seek other employment myself . I'm at the point of needing (small) doses of a sedative at work to calm my thinking which really is dangerous and untenable. Taking leave has not been of any benefit work-wise and I need some more permanent changes. I am planning to see a psychologist to assist with coping strategies. What are people's experience with HR processes at work? Should I push for a more formal process? I know I'm within my rights.