Mental health process in Japan

Hi everyone,

I'm dealing with significant stress and mental strain recently, and I'm considering taking about one month off for recovery. I don’t have any paid leave left because I used it all during a previous hospitalization due to other health isssue. I recovered from that but it made me feel so drain mentally plus the workload and pressure have been extremely high. It’s now causing me significant stress and anxiety, to the point where I feel I need some time away to stabilize mentally., so I’m looking into the medical route (傷病欠勤).

For those who have experience with mental health treatment in Japan (心療内科 / メンタルクリニック), I’d really appreciate your insights on the process:

How easy or difficult is it to get a doctor to issue a 診断書 (medical certificate) recommending rest for mental health reasons?

Is it common for doctors to approve around 2–4 weeks off for conditions like stress, anxiety, or burnout?

Thank you.