Am I obligated by the social security law and Centrelink?
The job agency would have been bound by law to inform Centrelink if you did not choose to take the job as one of the criteria for being paid ongoing unemployment benefits is that all reasonable efforts are made to obtain employment. Having said that, I would have suggested going back to your doctor and getting written advice confirming that your meds are required to manage your condition, and that the use of machinery is contraindicated (not recommended due to risk). This should have enabled Centrelink to rule out that employment offer for you on the grounds that it posed an unreasonable risk to you and to your employer in the event that you were injured. *Don’t forget it was in the interests of the employment agency for you to take the job even for a day or two as they get payment of a placement fee every time they fill a vacancy…