I would feel anxious, too. I would worry about what people think me, feel guilty about letting the staff down, poo on myself for being "weak", ad nauseam ...

The truth is you probably will feel uncomfortable for a day or two and then it will be 'work as usual'.

I've worked with people who took time off for mental health issues and I always thought something like 'I am glad I am not in their shoes'. I don;t recall feeling resentful - just sad for them.

So maybe it won't be as bad as your are imagining. Keep your phone handy and call a friend if you feel really anxious. That always helps me - some loving support.

(((Hugs)))