Your choking story IKBB is the one I dreaded most. Found it quite hard - the fear of it happening - so much so that I wouldn't feed him certain meals. He used to wretch often (tho not the reflux thing thankfully), and I'd go into panic. But I used to imagine myself just dropping, or throwing him over the bannister - that may sound weird - but I just went everywhere in my head about it. I'd triple check the stair gates, and wake up in a panic at 3am that I hadn't locked it. It was bloody never-ending. I knew this sort of thing was going to happen, and that the rational mind would get overtaken, but to the extent that it did?. no.
I'm better now, and I've always been a bit rough and tumble with him... I've been tap tackling/stepping inside him in the park since he could walk - but those visions are still there. When he was 1 and just walking... he'd pick up a screwdriver or pencil or something and in my head he's already fallen on it and it's gone straight thru his eye and deep into his brain, and the whole story would flash past me in a split second - how I'd tell his mother - what I'd be like in 10 years time - how he'd cope with one eye. Over and over and over again.