Talk to Gynecologist on Baby Lactation

My second baby is almost 5 month he is on both feed ( top and breastfeed) 20 days back he suddenly stop my feed because at that time he developed flu like symptoms i tried him but he refuse and then i stop breastfeeding him i thought when he feel better i will tried him afterwards but my milk production stop and i am trying , i take him to half hour but he is not taking it is there any medicine should i take for milk production