Sneaky anxiety/ postpartum depression

So last night during his last breastfeed before bed, I got this uncontrollable sense of dread. That if I put my baby down to bed, that it would be the last. I mentally, emotionally and physically could not let go of my child due to this sudden anxiety and fear. Let me be very clear, his room and crib are safe. I am in a very stable and safe home. The only health issue was a light cold this week that hit our whole house. Baby got the least amount of symptoms and I got hit the hardest. So I’m logically trying to remind myself that I’m probably tired from my arm injury, being sick and my hormones are resetting cause I just got my period. But my fight or flight would not let me sleep. I eventually put my baby to bed. But I could not sleep. Idk how to deal with that though! Does anyone else still feel bouts of anxiety or postpartum depression? Oh and baby is totally fine, happy and healthy.