My cousion had disc prolapse
.Now she is doing ok. She was on bed for quite sometime. Could exercise much later, that too very specific ones. I think her doctor suggested her some. She also had weight problem. Took her some time to loose weight. For calcium why dont u take some supplements. and eat lots of paneer and milk and eggs (if u eat eggs, sorry dunno if u do). But why dont u consult a diet and fitness expert. May not be manageable all by your self since u have both the disc problem and calcium problem.