By Aaliyah Rugg & Graeme Murray A family were told to say “goodbye” to their mum just days after she had merely scratched her arm on a wall. Alex Donaldson was abroad in Spain visiting her her dad when she met with some pals before travelling home. She brushed against a wall while giving her friends a hug but did not worry about the slight injury she suffered. But after flying back to the UK home the next day her arm began to swell and became “hot and painful”. The 46-year-old visited A&E and was told it was an infection and given antibiotics before being sent home. Her condition, however, rap…