I've name-changed for this. Will try and keep it as brief as possible. I think I'm posting for a kick in the head but, equally, try not to tear me to shreds please 
I work in a university, in a teaching-focused role. I am senior in my department and have been there almost 10 years. I have a lot of responsibility and get a lot of the flack if things go wrong because I'm the 'face' of the dept iyswim. The course I teach on is related to the Covid effort so my job is pretty safe. It is an intense course in terms of teaching and contact - our students have 35 hours a week teaching or clinical placement (although at the moment 90% of the teaching is online for obvious reasons).
I like most of my colleagues and am lucky to have a good relationship with my HoD and senior Faculty. I know I am valued by colleagues. I know I am tipped for the head of department role in a couple of years - the thought fills me with panic and anxiety which is very much unlike me.
I am just utterly exhausted, completely burnt out. It's not just Covid, although the pressures of that have probably exacerbated things. I was feeling like this well before Covid hit and actually in some ways the first couple of months of lockdown were quite interesting and challenging job-wise.
But now, it feels like being back on the treadmill. I have lost all my spark and I feel my cynicism and exhaustion filtering through in my daily life. I am starting to take student complaints personally and feel quite angry and helpless a lot of the time. It feels as if my resilience - which has always been good - is just ebbing away.
I don't dread work, but I just have absolutely no interest in it any more. I couldn't care less about all the stuff I'm supposed to care about. Every day feels like wading through treacle.
I have qualifications and experience that would allow me to set up on my own, but this would mean starting completely from scratch. I have been doing some extra courses (paid, accredited) in my own time (ha!!) to get me up-to-date on some things. Dh is broadly supportive as he sees that I am getting dragged down but he's worried, quite understandably, about money etc and the future.
I earn a decent salary, have a flexible job which should be fascinating and fulfilling. And yet I just can't stop thinking about not doing it any more. Is this possible, or do I just need to suck it up and be grateful?