How post partum has been for me..

So i have been diagnosed with post partum depression and the doc prescribed zoloft which i took for a week but didn’t really change much so i stopped having it. Now, otherwise i am completely fine but i dread the nights. I don’t want to be in my room especially when i have to be alone with the baby since my husband frequently travels out of town for work. There are other people in my home but they are in their own rooms. I am alone in mine with my 1 month old son and although he is a quiet kid who sleeps fine, i feel depressed and hopeless. Every time he makes a sound, i am overcome with anxiety. I dont want to sleep even when he is sleeping because i have this feeling that I’ll have to wake up again and my sleep will be disturbed so its better not to sleep at all. It’s 1.30 am here and I can’t sleep rather i dont want to sleep. I miss my husband and my sisters who would spend the nights with me. I love love and love my baby but my loneliness and anxiety are giving me a very hard time. Did any of you go through the same? And how did you manage to overcome it? Because zoloft is not working for me.