I have recently been diagnosed with vulva cancer and have been given an operation date of 16th January 2026 my doctor is reluctant to give me a fit to travel letter although he’s says he can’t stop me from travelling.i have a cruise holiday booked  before I go in for my op my nurse says that the letter with my diagnosis and impeding operation date should cover  For the travel insurance. Will this be sufficient  to travel with regards to my insurance. Im fit and healthy except for the diagnosis. Can anyone help