An NHS worker left fighting for breath by coronavirus has spoken of her excruciating symptoms in a warning to lockdown rebels.Karen McCabe, who has diabetes, told how the deadly virus left her feeling as though someone was ‘sitting on her chest’.The 44-year-old, from Edinburgh, first came down with the tell-tale signs of the virus while she was self-isolating with her children.She developed a barking cough and battled a soaring temperature with paracetamol.But two days later she was admitted to the city's Western General after experiencing bouts of vomiting while she gasped for air.Karen told the Record: “"I couldn't breath, and I really mean that."It was like someone was sitting down hard on my chest everytime I tried to inhale or exhale,