CKLD
I haven't read this whole thread yet, but I used to have emetophobia and trust me I had it bad. I can totally relate to days of panic. Currently it's not an issue for me but after seeing my dad die of a heart attack nothing else is scaring me. :-(
But if I was sick I'd still be in a pretty distressed state. The difference though is I'm not terrified anymore. I know now that I would be sick and it would be over in a short while, unpleasant but will pass.
It makes me sound like I was never phobic doesn't it, but I promise you I was. Big time. For decades my whole life revolved around it.
My way out of it was a mixture of things, but a lot of 'exposure.' I don't mean actually being sick all the time exposure, but other stuff, like gradually doing more and more things that I was avoiding, etc.....or eating things I avoided (but carefully and gradually).....If someone else was sick I would maybe walk away slower than before, so not necessarily exposing myself to the thing I feared, but just slowing down the escape, etc.....
Avoidance makes it stronger. Exposure weakens it, but at first it feels like things get worse....and it's about getting through that.
If I'm ill now, I still have a card with certain thoughts written on it, to remind myself of what to think at that time....because my mind will run away with itself when I'm in that state.
I don't think any therapist that delves into the past is necessary, but a therapist who does very good Cognitive Behavioural Therapy is worth their weight in gold.
I've learned that, rather than something terrible happen in my past, my body, when it's in an illness state, tends to also be closer to a panic state. It's that simple. The nervous system responding to the illness is also more twitchy and makes me feel panicky.
So it's been a lot of different insights, therapy, etc, and gradually over time I conquered it. If I was sick again I know I'd absolutely hate it, but I'd also know that I'm not dying and it will pass.
Perhaps one of the most useful things for me too was a drug that is called Buccastem (Stemetol). My doctor trusts me enough to let me carry this around in my bag. I rarely use it but if I were to feel sick I know that one of those drugs will either remove the nausea within about 5 mins, (it really does), or, if I'm really poorly, it will radically take the edge off the feeling and make it more manageable.
Hope some of this helps, you have my sympathy as I've been there and it's still something I grapple with.