Hello,
It usually take few weeks to get adjusted. If the sadness prevails even after that then you need to consult a neuropsychiatric center. If along with sadness you are having loss of interest in previous pleasurable activity, feeling lonely, change in appetite and sleep, low in energy, confidence, hopeless, helpless, worthless feeling and sometime even suicidal ideas. Then you might have depression. Few of these symptoms or all can be present at a time.
Next Steps
Consult nearby psychiatric clinic or you can consult me.
Health Tips
Make sure you are not alone try to be with someone close to you, share your thoughts, sleep for adequate time, have healthy meals on time, involve in activities you used to enjoy earlier.