Clare Morgan was going through a rocky patch: her long-standing relationship had hit difficulties and she was struggling financially. But the self-described 'optimist' felt she was managing to cope.

Then the 35-year-old biologist started experiencing unusual symptoms. 'Out of the blue, I felt really agitated - I couldn't concentrate, I couldn't sleep, and I felt very shaky,' she recalls. 'I'd been under some stress. But my symptoms seemed too odd for that to be the whole explanation.'

After about six weeks she went to see her doctor, who diagnosed depression and anxiety. 'I asked him if he was sure, because there were other symptoms such as diarrhoea, weight-loss and vomiting. But he confirmed his diagnosis and prescribed an antidepressant.'

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The Daily Mail - 29 June 2010