The very definition of stress highlights the flow on negative effects of adverse stress. " Stress is the adverse reaction people have to excessive pressure placed on them for extraordinary demands, constraints and opportunities".
You may have seen the Yerkes- Dodson bell curve indicative of the performance deterioration of higher than optimal levels of stress.
Also a report in the British Medical Journal in October 2002 found that workers who spent long hours in high-pressure jobs were twice as likely to die from a heart attack than those working normal hours.
Perhaps an anonymous report to an authority indicating the breach in duty of care towards flight crew, via willful disregard for crew welfare from senior management would do the trick.
An authority outside of Middle East might be the trick. ICAO?, Perhaps the ATSB or U.K CAA would be interested as no-one wants to have an incident/accident on their doorstep.
Good Luck all, I know what it's like to be under the pump.
Stay Safe