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Since Bekki Thomas was a teenager, she has experienced crippling pain and chronic fatigue that lasted weeks at a time.
Despite the severe symptoms, it took eight years for doctors to diagnose the Clevedon woman with endometriosis. GPs initially said her pain was caused from "over-exercise" or "anxiety".
The 26-year-old is now calling for more research and awareness about the condition to help other women.
"When I was 11, I remember being in a lot of pain. I thought it was pretty normal and just meant to be like that. There wasn't any research going into it, we didn't know much about it," she said.