Hello, formy_cool_friends, I am a little concerned about your symptoms. Abdominal pain, fever, vomiting suggests something acute. You said the tenderness was over the area of the appendix. If you are still sore if you press on that spot, I will be worried about appendicitis. Pain killer can dull your pain somewhat but that does not cure the problem. I am not sure if your doctor did a complete blood count to see if you have an elevated white blood cell count which would confirm infection. You need this. Ultrasound can show the gallbladder which is located in the right upper quadrant of the abdomen. Your location of the pain is in the right lower quadrant where your appendix is. If there is severe inflammation along with abscess or rupture, a CT-Scan of the abdomen will show this. In any case, if your symptoms get worse, don t wait , just go to a nearby medical facility for further evaluation and care. I wish you well.