Hello,
This is usually a common thing , an anxiety phenomenon ,when you are in expectation of some specific thing ,waiting out for long time.sometimes, you really feel numb or as if there is just vaccum ,that even ,pleasurable things are not interesting any more.This is transient ,usually settles down with time.Engage in mild physical activity of your choice and try to get back to your soon and it will settle down
Next Steps
If persistent ,fix up an appointment with a psychiatrist .