I'm so tired of being scared of losing my DD

[ChocolateRaisin09]

I realised last night that I can't be normal! DD is 7 and I still have to check she is breathing every night and whenever she is ill I am sick with worry that she might die. Seriously she had the slightest cough last night and I was so worried. So pathetic. Other parents seem to just roll their eyes when their kids get yet another cold, but I'm scared every time. I'm also paranoid about her choking (still!)
I don't think I'm over protective in day to day life, I know she has a not great diet, for example, and she's not aware of me being like this. My DH does say I'm crazy.
She's our only, and we did have a traumatic birth, if that's relevant. Do I need help?

Thank you so much for replies, I'm relieved I'm not the only person to feel like this and that its semi "normal"...
I did have PTSD after dd was born and a coupe of years ago had CBT which was brilliant. So in that respect I'm a lot better than I used to be! But the worrying when she's ill thing is exhausting, as you say. That idea of learning first aid etc is really good, surely that would take away some fear. It does get worse around pmt times so I can be aware of that. I feel like I need to give myself a good talking to.
I'm on a low dose of citalopram for the PTSD. Maybe I could get a few more sessions of CBT for this specifically as it was so good. Its interesting that a couple of people say its just a normal part of being a mum...