Hi, Welcome to Health care magic forum.
As you describe, you have gynacomastia, large belly, and hair loss, all the three are not related to one another.
It appears to be due to the hormone deficiency
, so i advise you to consult an endocrinologist
You may need to have an estimation of testosterone
, and estrogen
Besides you should try to control the weight, by, diet, exercise, and sleep planning.
If all the measures fails,and the breast size is very large, you may have to opt for plastic surgery
Wishing for a quick and complete recovery. Thank you.