HI Thanks for posting your query. Well a low cortisol levels can definitely explain your problems . You need to get further tested to check for the cause of low cortisol levels. Low Cortisol levels usually happens due to problems in Adrenal glands , but what is the problem has to be evaluated . It needs further blood tests and scanning test. In this regard I would recommnend you to consult an Endocrinologist and get yourself evaluated. Hope this information was useful to you. Any clarifications feel free to ask. Regards.