as stated in too at webmd
"Asthma attack symptoms include:
Difficulty breathing, shortness of breath, or very rapid breathing
Severe wheezing when breathing both in and out
Coughing that won't stop
Chest pain or pressure
Tightened neck and chest muscles, called retractions
Difficulty talking and performing normal daily activities
Feelings of anxiety or panic
Pale, sweaty face
Blue lips or fingernails
Worsening symptoms despite use of your medications"
reference:
http://www.webmd.com/asthma/guide/asthma-attack-symptoms