post appendectomy complication - HELP

My dear friend had his appendix removed laparoscopy on Oct 20, was released the next day, slowly introduced diet, puked it all out on Oct. 24.  Went back to ER on Oct. 25. IV connected. X-ray and CT scan completed on Oct 26 and found abscess on his lower abdomen pelvis area size of tennis ball.  Docs say they cannot reach there to drain so they just put him in IV antibiotic (Zosyn) and IV fluid.  The antibiotic is given every 6 hours.  He can’t (not allowed) to take food/drinks by mouth.  When we asked the doctor about draining the pus out he said your body will absorb it.  My friend is stable with pain med, gets diarrhea.  I am concerned they are not taking the abscess out.  Also, there is fluid in his stomach they said is normal after surgery.  What do you guys think? Similar experiences?