I had something like when I was 14 - cost me a year of school. Used to wake up about 9am have breakfast, sleep until 6pm, eat and back to sleep again. Do about a week of this, gradually feel better, get up, feel ok then back to sleep again. Lasted about a year but I did grow about six inches taller during this time as well. Fine after that. Loads of blood tests, some showed anomalies others were clear, advice was ' rest '. Not very practical if you're running a business though - I wish you a speedy recovery.