Bad thoughts/dreams?

So ever since I gave birth to my daughter 10 months ago, ive been having bad thoughts of things happening. For example, I was holding her one day and I was thinking “what If I were to accidentally drop her and she’d get hurt?” Or one night i was going out on date night with my fiancé and before I left I hugged her and gave her kisses and then I thought “What If we get into a car accident and this would be my last memory with her?” I have thoughts like these constantly. They come out of nowhere and I just cry. They’ve been getting worse, except now they’re turning into thoughts I feel like are attacking me. I think about bad things sooo much everyday that I feel like I’m starting to physic myself out and I glance at something and think I saw a silhouette of someone then I look again and it’s not there. Last night, I dreamt about fire and something trying to attack me and then a cross flew across the room (in my dream obv) trying to hurt me. When I woke up I felt SO unsafe and uncomfortable so I was looking around my room and thought I saw someone sitting on the floor when it was just my hamper. I could not fall asleep at all so i tugged on my fíance to hold me and then I felt better.. I don’t know if this has to do with me giving birth to my daughter but my thoughts are out of control and I can’t get away from them