Recently I've been feeling more and more detached from work. I thought about taking annual leave but I'm covering for my boss who just went on paternity leave.

Recently I've been feeling more and more detached from work. I thought about taking annual leave but I'm covering for my boss who just went on paternity leave. My employer also coerced (forced) us to take a big chunk of our annual leave already because of concerns there will be a huge clash later in the year. So I feel reluctant to use even more of it and then suffer later in the year. I also thought about asking for unpaid leave but I just moved to a new role and it might be a bad look when I have my review in 6 months. I'm having a harder and harder time sleeping. Sometimes I only get 2 or 3 hours and I'm up at 4am with what feels like a high level of anxiety, worrying about many kinds of scenarios. Sleeping pills I bought over the counter seem to have no effect. Would be great if my employer gave us a week to breathe like some companies have, but we're also a startup who just got acquired, so no chance of that either. I'm struggling.