Hello!
Thank you for the query.
As you have mentioned, right sided
abdominal pain should be always checked with
appendicitis. And the appendicitis diagnostic is as hard as hell. Nowadays in the edge of CT scans and MRIs we still can not find a way of ruling our appendicitis other than surgery. So if your abdomen
ultrasound tells that no appendix was found, it does not meant that you do not suffer from appendicitis. It just means that the doctor couldn't find it at all.
If you were treated with antibiotics during the hospitalization, there is a chance that this antibiotic treated your appendicitis for a while. In 50% of appendicitis antibiotics therapy will give positive response. But it does not treat the appendicitis permanently.
So the conclusion is, if all others possible reasons of your pain were ruled out, and the pain is not gone or the pain is recurring, there is a time for surgery to remove your appendix.
And by all others diseases I understand:
pregnancy,
urinary tract infection, urinary tract stones,
ovarian infection,
ovarian cyst.
And if its about your blood work results, if an antibiotic is given, CRP and WBC will be low. So it does not rule appendicitis out either.
Hope this will help.
Regards.