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I was very active, a mum, with two teenage kids. I used to do lots of triathons. I've done marathons. I started my PhD and I was

teaching students at university as well. Nikki Proctor was busy, social and active, not just doing triathlons herself, but coaching them too.

But over several years, she started to find that her endless energy was draining away.

I would go for a 5K run quite easy and find that I was just exhausted and worn out for a couple of days

afterwards.

Nikki knew something wasn't right, so she went to her GP repeatedly.

They'd send me for standard blood tests, and they'd all be pretty much normal.

And so as a consequence of that, the GP would say, well, I guess it must be psychological.

She was put on antidepressants and recommended therapy, but it didn't help.

...