I Have Had An Operation On My Ear With Askin

I have had an operation on my ear with askin graft for sun damage I have been in great pain ad have been prescribed co codamol 500g I have now developed an infection and have been given flucloxacillan plus ibuprofen in between I have now been sick and I have also not had a bowel movement for three days any suggestions on whether to carry on with all this medication