Similarly, if you think you have taken this drug elsewhere and start to feel unwell, our advice is to seek urgent medical attention.

BBC: Pair held over Farnham teenager 'drug death'

He began to feel unwell and his health began to deteriorate.

BBC: Fraser Sneddon, Nicola Sturgeon and Lesley Ross

That, combined with sleep disturbance, could make people feel unwell.

CNN: Sad in the spring? Allergy-mood link is real

The indictment argued that an intelligence ministry doctor had routinely examined Zahra and pronounced her fit just an hour before she began to feel unwell, and it must therefore have been a ministry interrogator who hit her.

BBC: Iran: A Murder Mystery

Many people who catch measles will have a fever, a rash and feel generally unwell.

BBC: 'Alarm' at suspect measles cases

Many people who catch measles will have a fever, cough, red eyes, and blocked nose and feel generally unwell.

BBC: Measles: 189 cases in Swansea, Neath and Port Talbot

It suggests passengers get off at the next stop if they start to feel poorly, and do not board a train while unwell.

BBC: Rail passengers told 'eat breakfast' to avoid delays