Thanks everyone. The doctor still couldn't find out what is wrong, and
the result from the last round of tests are inconclusive. The
antibiotics seems to have worked so they are continuing the treatment.
The doctor has now ordered some scans for the whole body, and we are
told that the test results should be ready next week... I was a little
more relieved when the antibiotics worked but now I'm really quite
worried again because the doctors couldn't find the cause..