I fear to be in a small closed space. once i went on a lift full with people n feel like harder to breath. my face went so pale.wht cud cause this?

Anxiety: Could be anxiety related to claustrophobia. You might want to wait for the next lift if you have the time, to have a less full lift. Deep breathing and focusing on the outside of the lift would be helpful.

Cllaustrophobia?: You describe a well recognized condition call claustrophobia. Someone also needs to make sure you don't have a breathing problem. If this just started, this may indicate that there is something particularly stressful going on in your life and there is a good chance you will benefit from talking with a psychologist or psychiatrist.

It sounds like this: is a chronic issue for you. Irrational fear of small, enclosed spaces that negatively impacts on your life can be consistent with Claustrophobia. The description is consistent with hyperventilating. The fact that the elevator was stuffed with people likely worsened your symptoms. This is treatable.

Panic Attack: Your claustrophobia (fear of being in a small or close/d space) let to an anxiety or panic attack. Panic attacks can have symptoms such as shortness of breath, panic/anxiety, palpitation (fluttering in chest), lump in the throat, numbness of the face, and more. This is not Panic Disorder, where unprovoked attacks occur. You can go to The Panic Center, or Anxieties.com online for answers.