You are probably suffering from claustrophobia
, which is nothing but irrational fear of closed spaces like lifts. Your symptoms are suggestive of a panic attack
with palpitations, sweating etc). If this problem is significantly affecting your lifestyle, then consult a psychiatrist
and discuss the possibilities.
Also, your weight is on the higher side (in relation to your height). Incorporate a low fat, low calorie diet and regular physical exercise in your routine.