Is this any help?.....
Anxiety - A Self Help Guide Does it describe your symptoms?
It's difficult to diagnose by internet, but your symptoms are suggestive of anxiety.
You probably need to talk to someone in more detail to confirm the diagnosis, but beware that an admission of your symptoms may convulate the gaining of a medical certificate.
Low level symptoms may be controlled by low level interventions (the exercises in the leaflet do really work), and exercise.
Giving specific advice here is frowned upon, (for good reason), but it may be worth trying the low level stuff initially.
Good luck.
PS, if we're all honest, we've probably all felt like this at some stage in our lives-even the big boys.