ppd and feel so alone

I feel so alone, like I can't talk to anyone. I'm struggling with ppd. Keep having thoughts of terrible things happening to me or my baby. I'm struggling with my dads terminal diagnosis. Struggling basically being a single mom of 2 kids during the week because of my husbands opposite schedule. I'm struggling not seeing my husband throughout the week. This app is the only time I can get my emotions out. I have no one that I can turn to for support, or just a good hug. My husband and I work on opposite shifts so we only see each other on the weekends. But the weekends we visit my family and his family and we do family things with the kids since he doesn't see them all week long so there isn't time for me to confide in him. I can't talk to my dad cuz he's battling terminal brain cancer and doesn't need to be worrying about if his children will be ok when he dies. My mom swears she always has something worse going on in her life. For example, when my dad was first diagnosed I cried to her. Her response was,  "i know exactly how u feel. My back pain has been terrible" like wtf? How does ur back pain equal my dad dieing of cancer? My friends and I have become distant since I had kids and got married. I can't sleep because of these constant nightmares. And the lack of sleep is making me fall asleep driving to and from work.