I don't have inputs on the earning side. I have faced the work-stress myself in the past and have found "Agile Mindset" to be useful in pre-empting stress related to inevitable screw-ups.
1. You focus on "fail fast". i.e. you define a task completion date, completion criteria and figure out if something has failed within that bounded time-frame. This mitigates failures from festering and damages from those failures compounding.
2. You DO NOT focus on Root Cause Analysis in the middle of dealing with a damage control situation. This (focusing on unproductive root cause analysis) is probably the biggest cause of stress. You religiously do a "Sprint Review Meeting" (
https://www.mountaingoatsoftware.com/agile/scrum/meetings/sprint-review-meeting) at the end of every sprint where you focus on all RCA and other general improvements. If someone brings up an RCA discussion (e.g. "why did this happen?") when you are knee deep in mitigating it, you shut him/her down by saying "we have a RCA planned for X date, I'll send you the invite and we can discuss this there". You need to do that religiously irrespective of the rank of the person asking it. And then, of course, you do proper root cause analysis in the sprint review meeting. If you can't avoid the question (e.g. if the CEO is asking it) then you stop all work on mitigating the issue, do RCA, and then get back after you are done with it, with full understanding of all parties that this will delay the fix.
Please note that there is a lot of buzzwords and unproductive ceremonies associated with the whole Agile stuff. Please don't get sidetracked by them - just try to understand the reasoning behind those and focus on that.
You need to be very hands on to be a good, Agile, project manager. i.e. you may not need to be a petroleum engineer, but you better understand all the components that go into digging a well and don't get lost when an engineer explains you why the "normal" way of doing things need to be adapted in this situation. This ability is important everywhere, but critical for Agile project management.
If you are doing PMP, that is great and will likely make your resume attractive. Last time I looked into PMP (a decade ago, not sure if this is the case now), however, it was all waterfall and militantly anti-Agile. So be careful there :-) Unfortunately, I have found all Agile training courses to be heavy on rituals and low on the reasoning behind it - so can't recommend any of those either. If you are used to consistently mitigating screw-ups and completing projects successfully, then you are probably doing Agile intuitively without realizing. Just read up a bit more on how other people think about it, and maybe you will feel this whole thing to be so much under control that it will stop bothering you or stressing you out.