got ruptured and there was collection of pus in the abdomen.The pus would have drained and the abdomen was cleaned.But,a drain should be kept in this type of cases.If it is not kept ,the collection will be left inside and there will be distension of abdomen.You should go for an Ultrasound
abdomen to see for any collection inside.Then,proceed accordingly.
Weight will not be reduced drastically in few days.Do not bother about your weight.
If you come back with Ultrasound report,i will clarify further
Wish you speedy recovery