Severe Depression. Started now agai!

I have MDD. I cant go out and chill without any stress. Even a simple walk around I cant do due to anxiety and stress coz of depression I feel lost. Also, When I speak I cant think and reply with what I wanted to (always in confusion) especially when I am in a conversation with someone. I mean its not a problem but it creates embarrassment situations because I realise the things later at times coz in real time I either get lost in the conversation due to unable to either concentrate or respond properly. I am rarely and hardly able to present my  clear view of whats asked and I realize later that I shouldve responded that etc. I was prescribed Dveniz 50mg as an antidepressant, it did help at initial start or sometimes it had helped me in my work but very less times. Also, I could feel the sideeffect as constipation from this medicine though I take laxative when I feel that, but I wanna still know is this medicine effective I had closed the doze few months back and have started now agai