I accepted a temporary promotion at the start of the year. Went from being part of a team to functionally managing that team, but still being asked to do aspects of my old role. I haven't had time to do any training (not that there's a training plan, just a handover document) because it's been in at the deep end since I started. Emails are building up and the to-do list is getting ever longer while I just seem to work reactively to whichever issue (internal or external) pops up on a given day. Feels like I'm drowning. It's stopping me from sleeping and I am getting more and more anxious.
I have raised a stress report with my manager who advised I take some time off but it's just made me feel worse, because the work just piled up while I was off; there's nobody I can delegate to because they're all busy themselves. On top of this, a team member is challenging my decisions and my confidence is nosediving.
My old role has been backfilled but there are vacancies in the team, although I don't particularly want to go back to that role. For the sake of my mental health I feel like I need to step down as soon as possible. Taking this role was a mistake, but I think they will try to make me stay in the promotion job.
Any advice/experiences welcomed.