By Wesley Holmes & Sam Elliott-Gibbs A fit and healthy young man who was putting the finishing touches to his dream wedding suddenly died after a series of bad headaches turned out to be a sign of something far more sinister. John McDaid was looking forward to getting married to his fiancée Navi Palmer this summer and was due to jet off to bustling Berlin for his stag do next month. But after being struck down by terrible head pain and sickness in January, the athletic ‘fun loving’ 31-year-old was diagnosed with a stage 3 brain tumour. His condition rapidly deteriorated, and on March 14, he su…