You can make some modifications to it by experts or supervisors for your study, and it is available at this link. Thank you http://www.me-jn.com/April%202019MEJN/Expanded%20Nursing%20Stress%20Scale%20(Scale%201).htm
Expanded Nursing stress Scale (ENSS) has been used to measure nurses job related stressors. The ENSS is an expanded and updated revision of the classic Nursing Stress Scale (NSS) developed by Gray- Toft& Anderson (1981). The NSS was the first instrument to target nursing stress rather than general job stress