If it affected your tendons Magnesium is recommended. I'd also speculatively suggest iodine (a few mg per day) and glycine (1-20 grams per day). I am not a doctor, but then that's who prescribed you that crap ;-)
I have chronic fatigue likely brought on by mitochondrial dysfunction. Iodine ended a 12 month long mono infection and is the difference between having enough energy to spend the day reading.