Well you already know where it leads. I think if you have a smart manager, a good long talk might be in order; explain that if you feel the urge to bolt and find another job, it's probably not a good idea for anyone involved. Explain that as much as you are ok with 'pressure' there is a pressure point where it breaks, and you feel it's not far off...

If you don't have a smart manager, well, take off QUICK. I had a burnout in 2006, took me the best part of a year to recover, and that was actually quite hard.