Signs and symptoms vary from individual to individual so it may be useful to know these signs and symptoms. These include difficulty breathing, severe wheezing, chest pain, blue lips, feelings of anxiety or panic, coughing that won't stop, tightened neck and chest muscles. Your fainting may have been brought on by any of these or, yet, there may be another underlying cause for that. I suggest you seek immediate consult with your physician for proper evaluation, diagnosis and treatment.