Bad Service and crew ill treatment towards passengers

Had a very bad experience with the emirates flight while travelling from Hyderabad, India to Dubai where the passengers are not allowed to use the toilets for more than an hour before landing. My 8 year old kid has suffered for an hour with full bladder urgency until the flight has landed. which stressed me a lot and felt very bad with the flight crew ill treatment swearing on us when we asked for help. who is liable if some health concerns raised out of this. This is an unsatisfactory and very bad service that i ever had with any airlines who can't deal with the urgencies and emergencies of the passengers. We understand the flight instabilities in the air but the relevant staff must be efficient enough and make sure to deal with these problems and comfort the passengers. This is an unacceptable treatment by the flight crew. Hope this post will be reviewed by the concerned authorities to take necessary action against the crew and help the passengers in future with these type of discomforts while travelling in the air.