Please don’t take this as an intrusive inquiry, but have you ever been tested for sleep apnea? I had been having many of the symptoms you describe and literally had to fight falling asleep at midday for more than a year. Once an over night sleep test revealed I had sleep apnea, I started using a CPAP machine. My energy level was restored and I rarely struggle with brain fog or sleepiness during the day any more. Please forgive me if I seem to be not respectful of your struggles with chronic illness. I really applaud your determination to not let your chronic illness rule your life.