A “tired and scared” frontline NHS worker has penned an open letter begging Scots to stay at home to protect the health service from Covid-19.In a letter to the Daily Record, Gillian Mulligan, an operating department practitioner at Hairmyres Hospital in South Lanarkshire, told how she is working exhausting shifts caring for the sick and dying after undergoing emergency training to work in makeshift intensive treatment units.The 49-year-old mum-of-three, from East Kilbride, urged the public to “stop and think” about leaving their homes for unnecessary trips, saying she and her colleagues are working in fear as the number of coronavirus victims being treated in Scotland’s hospitals reached almost 1,800 yesterday.In her letter, entitled “a