Hi, welcome to our site. I am Dr Saumya Mittal. Read your query. That is a very significant question and i appreciate your problem. I will try my best to answer your query What happens is that in asthma the airways are narrowed. So the air is not easily taken into lungs, and similarly there is a difficulty in letting out the inspired air. So overall the lung s air volume is low functionally. After an acute attack, did you go back to the doctors for a repeat test. It is a possibility that your lungs need long term medicines and therefore though not as symptomatic as in acute condition, your fatigue is indicating that you may still need treatment Also suggest testing a hemogram I hope this helps you. Inform the reports mentioned above so i can be of help further. Best of luck. I have given you the answer to the maximum considering the information provided. The results of the tests could further enhance my answer to you. Please do understand that some details could be extracted from a detailed history and examination. Looking forward to your return query with the details asked so that I can help you further. (If the answer has helped you, please indicate this)