i have been on prednisone for 4 years started on like 30 then slo...

i have been on prednisone for 4 years started on like 30 then slowley went down staying between 5 and 10 mg for about 2 years i just slowly went off because now i am on embrel shots and they are working i have been off about 2 weeks i have terrible mucle pain and the tierdness is horrible sleeping like 18 hrs a day and it feels like someone beat me up the pain is so bad i can hardly go up 5 stairs to go to the bathroom without taking a rest how long will this last and is this from the prednisone or could it be something else