Suggest Treatment For Back Pain Due To Spondylitis

hi doctor.sir I have been suffering from back pain from last 2months, I don't feel comfortable while working or resting. earlier I thought the pain is because of heavy weight exercise. I have done x-ray and doc. told me that I have spondylitis.
I had back pain 2 years back also, but it was cured after medication and exercise. but I don't know the causes of pain.

sir is spondylitis curable?, if it is curable, how long does it take?
should I continue weight lifting or not?

my age-21, height-182 cm, weight-67.