I don't know mate to be honest. I can't remember any specific incidents triggering it but I'll have a think if there's a common denominator somewhere. I think it's just a case of a big increase in workload and increases in "office politics" going on. Had my blood taken last week and all seems ok there, just waiting for Vitamin D results. If that's ok then I can only think it's stress causing it.
As
@anjelikaferrett says report it mate. Burnout is very real and if you do end up having to take time off due to it, you've put them on notice by reporting it.
Unfortunately being able to " cope " with the pressures of an a unacceptable work load is still seen as a badge of honour in many places and essential to promotion.
My work situation is what made me ill in the first place. Think of your brain as an elastic band. If you keep stretching it, eventually it will snap. The effects can be far reaching and long lasting. I'd hazard a guess and say that the way you are feeling is your bodies way of telling you to slow down or stop.
On a lighter note I worked in a Solicitors office, where a senior Solictor, who was under insane pressure, got up from his desk one day and said he was going to the shops. He switched his phone off and was never seen or heard of again, leaving a massive case load and a enormous pile of big case files. Sticking two fingers up doesn't get better than that !