hello welcome to hcm.
Since you are already under the treatment......if the improvement is there, i think he should continue and gradually discontinue the treatment of anti deppresents. please use other helping aids
, hang out with frnds and family, look for the psychological cause and if psble work out on that, because untill and unless the cause not treated treatment cant be done. yOU seems patient's son, so console him about the changes in life, provide him support, gradually this will help him out.