My job has an employee assistance program, where you can tell them any illness, stress, problems you maybe having. A co-worker of mine abuses drugs and alcohol, he went to them for help and they granted him sick leave for 3 months while he attended a rehab facility. Our boss or other co workers were not privied to the information regarding his illness (although he told me). All they knew was that he was out on medical.
Check your human resources see if they have any assistance programs like that.