It's exhausting when the business does not give you the support you need and leans on you to do too much work. Find another place to work where they do things without stress (ask them in the interview about their stress levels and workload). Make sure leadership are actively prioritizing work that shores up fundamental reliability and continuously improves response to failure.
When things aren't a tire fire, people will still ask you to do too much work. The only way to deal with it without stress is to create a funnel.
Require all new requests come as a ticket. Keep a meticulously refined backlog of requests, weighted by priorities, deadlines and blockers. Plan out work to remove tech debt and reduce toil. Dedicate time every quarter to automation that reduces toil and enables development teams to do their own operations. Get used to saying "no" intelligently; your backlog is explanation enough for anyone who gets huffy that you won't do something out of the blue immediately.
When things aren't a tire fire, people will still ask you to do too much work. The only way to deal with it without stress is to create a funnel.
Require all new requests come as a ticket. Keep a meticulously refined backlog of requests, weighted by priorities, deadlines and blockers. Plan out work to remove tech debt and reduce toil. Dedicate time every quarter to automation that reduces toil and enables development teams to do their own operations. Get used to saying "no" intelligently; your backlog is explanation enough for anyone who gets huffy that you won't do something out of the blue immediately.