6 weeks 2 days and worst cold ever

Michelle • 33 year old from Australia , currently pregnant with baby #4 a boy..miss 7 mr 5 miss 1 and prince due 26/01/17
I'm in panic mode , I have the worst cold ever I can't stop coughing , my back is hurting from coughing so much .. Can this hurt the baby ? I asked the chemist for something i could take and they said nothing is safe enough this early on ? My throat is so swollen and I can't breath though my nose at all :/: