mainstay of treatment in schuermanns disease is excercise and maintaining proper posture
Any activity with forward bending may aggravate the symptoms for which you may need short course of analgesics with muscle relaxant
, rest and hot fomentation .
Ask your g p to give some anti inflammatory along with muscle relaxant other than diazepam
lastly you should regularly do yoga
asanas ,few yoga poses which may help you is -shalabh asan, bhujang asan, shetubandh asan
this will help you to avoid such acute attacks. and never forget to maintain the proper posture