To answer your title question, I don't think burnout is an emotion. I think it's more a physical state that tends to put a damper on your mental and emotional capabilities. i.e. When you're burnt out, you can only feel a few, usually negative, emotions and your thinking tends to be mostly negative. So that's three different issues, physical, mental and emotional, that can easily spin out of control.

As I moved up in my career the feelings of self-doubt started to rise. That gave way to trying to combat that by working more and taking on more tasks, to prove myself. Worse, I stopped taking time off from work. That lead to months and months of 60-70 hour weeks. Any doctor will tell you that's not sustainable. I stopped getting adequate sleep and my body was not doing well, as I was eating more junk because I didn't feel I had the time for something better. So I was living a pretty terrible life of stress and self-doubt and I started being short with my dogs when we went on walks and just trying to get back home to work, rather than taking a few extra minutes for them and me to be outside and relaxing. I felt resentful when the company had a long weekend holiday, because all of my peers were taking theirs.

What stopped me finally was needing to go to the ER a couple of times because my heart was racing and I just knew I was going to have a heart attack. Fortunately, I didn't, but it was a good wake up call. My body was under tremendous stress, which is not good. My emotions were basically anger, worry and sadness. And my thinking was that I just wasn't good enough, which led to pretty significant impostor syndrome. So, I quit. I walked away. I choose me over work. It took 6 months before I stopped waking up in the middle of the night to check emails. But I'm much better now overall, though I still have some significant self-doubt.

I think the best thing, is that you recognize that things aren't quite right. The only advice I can offer is to pick one of those 3 components and really focus on it. I chose physical. Long walks with my pups, exercise and diet changes. But then do little things as you can to support the other 2. Disconnect from the world for a few hours a day. Walk, journal, meet with friends (when this is all over). Get some sleep Take a real vacation. Get back to your hobbies and interests. And learn more about ego and how it's holding you back.

I hope this helps. Good luck, you are totally not alone in this. It's was common before the pandemic and it's only getting worse. Choose you.