While it can be Appendicitis
from symptoms was there any fever? Any pain on right side back radiating to the right side of stomach?Has Urine test been done to rule out Urinary Infection or Stone on right side?
If Urine is normal,CLinical Exam by Doctor and Ultrasound
may pick up Appendicitis specially if the total count on blood test
is very high
Do get back if findings dont confirm the diagnosis
Best wishes for early recovery