I’m so sorry this has happened to you. I remember one of my mum friends saying that dropping your baby/ them falling happens to almost every parent - so take it as you’ve been officially initiated 🥰 don’t beat yourself up, I’m sure you’re an amazing mum. It’s hard as it is and you’re doing great. If in doubt don’t hesitate to seek medical help, but I’m sure if you do they’ll also reassure you that as awful as it feels, it is common. It was probably just your tired brain reacting quickly. Sending love your way and hope you feel less bad tomorrow.
Try not to feel too bad, things like this happen to most of us at some point. He will have already forgotten about it! A couple of months ago I did up my babies sleep sack popper and caught his skin. He cried, I cried, it was such a mess. He had a little bruise, his first ever bruise, and it was my fault. I was distraught too but after mentioning it to others they told me very similar stories. Don't worry, you're doing amazing.