I am so sorry for your loss. Get some professional help. If your doctor recommends anti-depressants, that is okay, but do the talk therapy too. Don't just take a pill and think that the pain is gone.
Talk therapy is the best thing that you can do. When you loose someone you love, it is like a big box in front of you and you can't see anything else. No matter where you turn the box is there. Your baby's box is so big now it is all you can see. Taller than you, wider than you.
Eventually it will get smaller and you will be able to put it into a corner of your mind. It will never really go away, but it will get smaller. But now your baby's box is in front of you. It is part of your stages of grief. Don't be in a hurry to put it away. It will go away when you are ready to put it away.
Cry your tears when you need to. Eventually you will be able to stop crying, or only cry at home, or only cry for ten minutes, or only cry for five minutes, or only feel sad, or only feel sad sometimes.
But all this will be easier if you get professional help. I know because when my dad died when I was 17 I didn't get help and never cried. When I was in my thirties I finally got help and understood my aching hole in my heart and finally cried my tears.