Is this normal TRIGGER WARNING

My post partum anxiety never went away. I didn't get help at first because they said they would send a social worker and I was scared they would her get away if they knew how crazy my thoughts were about something bad happening to her. It was very bad when my child was a baby and she is almost 4 now and I'm always getting flashes in my head if she got hit by a car and the whole scene plays in my head like her head getting crushed and blood coming out and me screaming and I can't stop it and it makes me start to hyperventilate sometimes or I will drive her to the park and think what if she gets abducted or I think what if she starts school and she chokes at lunch and nobody can save her and I will see the scene in my head and I can't stop it and it makes me sick and so scared all the time. I told my therapist but they just give me pills and it doesn't go away it just makes me tired I've tried 5 different medications now and it won't stop. I've tried a few different doctors and therapists. No change. I am scared to leave her with a sitter incase she chokes and dies and I'm not there or something sick like that. I can't even control myself it's horrible I don't want to be like this I'm tormented every day. A friend of mine just says it's mom brain but I don't imagine other people walk around feeling this way.