I got back pretty successfully into a high pressure job with v demanding mental health patients. I did it with an understanding manager who allowed me to

(a) initially just come and do paperwork - so I didn't need to see the patients, the most stressful and demanding part of my job.

(b) have lots of short breaks, whenever I wanted

(c) go home early to start with when I needed to.

(d) work in a seperate office when my shared office was too noisy

also (e) I took all my breaks in a separate room on my own, to give my brain time to recover. A break in a noisy office is no help at all.

and (f) I used some days of my annual leave entitlement to make my weeks four day weeks, to give me more time to recover.

Don't know how much of this stuff is possible for you but I gradually needed less and less of it until I was pretty much doing my full duties (though without the physical exercise/sport I had previously done as part of my job).

Although it worked, I then got jolted hard by an over-enthusiastic patient trying to give me a bear hug from behind, which has set me back almost to square one. But the approach above did work up until that point.