The signs and
symptoms you describe are cause for concern, including the breathing problems, the
pneumonia that has not cleared, your weight loss and stomach problems, bone pain and shrinking height. The last 2 could simply be due to osteoporosis but could also be symptoms of other bone diseases.
The first step should be the CT scan to assess the "white spot"; then whatever other studies might be required to make a diagnosis of that and your pneumonia. A biopsy might be needed.