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The medicine you are mentioning is STEROID
They have several and sometimes serious side effects.
It should not be taken for simple joint or back pain
and for such a long time.
Sudden stopping at this time is also bad - should be reduced in steps.
Probably your doctor must have given for a specific reason - generally it is Rheumatoid, Collagen
Disease and so on. Have a second opinion
You should see a good bone and joint specialist (Orthopaedician) / and an Internist
You need investigations - blood tests; MRI
of spine and/or joint ...
A proper diagnostic work up is a must for treatment planning...
Wishing speedy recovery