Hi welcome to Health care magic forum.
Thanks for choosing H.C.M.F.
You have got pain at the navus , the doctor told you that you have a small umblical hernia
. You also got a smelly, brown, bloody discharge as well.
Hernia is entirely different and you are getting discharge due to some other infection, most probably a bacterial infection. Dont worry it will be cured soon with antibiotics and supporting medicines as you are already under treatment.
Regarding hernia you need not worry, if it is increasing or bothering you can go for operation.
Wishing for a quick recovery.