Welcome to HCM Forum,
After going through your problem - It seems that you had Depression
disorder previously and taken a treatment for month and stopped medicine later on - tried to control thing by other means.
Its important to know that when you diagnosed as having depression that means certain neurochemical (serotonin) changes in the brain causing this trouble.When its in initial phase i.e. milder one can be controlled by Yoga
But when there is significant change in that neurochemical indicated by disturbed sleep and affecting your routine then - correction of that pathology first and continuing other method along with this later is only solution.
Remember medicine takes 3-4 week time to starts its action and minimum of 6-8 month for permanent improvement when there are less chances of recurrence.
Though you start feeling better within month of treatment (Giving false impression that I am all-right and can take care of myself without medicine),that was just a symptomatic one and not due to correction of underlying pathology.So after stopping of it within few month you started having problem again.
So please consult to your psychiatrist
again and restart appropriate treatment,continue it regularly till advised by him.
Hope it helps.