I come home each evening, absolutely exhausted after a full day's work, during which things are so hectic I rarely get a lunchbreak and with a pounding headache that takes several hours to go away.
My workload keeps increasing, there's no extra resource to compensate and no possiblity of deferring some work as it must be delivered to strict deadlines - which I cannot influence.
When I try to tell my boss this is not sustainable I am "being negative" 
I can't see any other option but to change jobs - this is killing me.