How Can Cold, Ear Infection, Cough, Diarrhea With Vomiting Be Treated?

hello sir, i;m suvitha gave birth to girl baby in october 09....then joined work in december... so gave breast feed for 3 months... due to irregularity lactation stopped slowly...now my baby s completely dependent on aavin milk only. now she s suffering from severe cold which led to ear infection, cough... sometimes diarrhoea... sometimes vomitingwe r givin antibiotic. wat should i do? is it possible to start breast feeding again. if so prescibe medicines for me..? baby weight at birth= 2.5kg baby wt now =6.5kg normal delivery