hi i am a newcomer to this site and i have been on prednisone for...

hi i am a newcomer to this site and i have been on prednisone for 3 weeks and actually i took my last pill todayi have also been experiencing side effects like, little sleep, aching bones and muscles, acid reflux/hearburn, quite often urinating and hunger..actually hunger is the only side effect that i don't mind having as i had very little appetite before and is underweight for my height so i actually hope to gain a little weight..how long does it take for the side effects to leave your body and if i only took this for 3 weeks will it leave any permanent damage, like bone problems?????