Well, Danielle Collins who has now just made the Aussie Open final suffers from endometriosis, which is a horribly debilitating condition for women, and unfortunately quite common. She's been living on anti-inflammatories for years. Finally had proper diagnosis and surgery. Which she says has freed up her life no end - and we can see the result

Sorry, I know it's not GB but seemed relevant this week.

Katie Boulter suffers from Chronic Fatigue Syndrome, although she says she's now 'officially' fine (i.e. managing it perfectly, or so she claims).