I have, like you, suffered with this Phobia since childhood. It has ruled my life for as long as I can remember. I don't drink alcohol (just in case), I don't eat after 8pm (just in case), I can never finish my meal, I won't go on boats, I can't sit in the middle of a row of seats (have to be on the end...just in case). I do have children, they are older now, but learnt at a very young age that, if they were sick, they had to deal with it themselves (I just went into a meltdown!).
Believe it or not, I work in a hospital, on wards with sick people! My friends and family thought I was mad to perdue a job in the NHS. I'm not gonna lie, if a patient starts showing signs of being sick...I'm outta there, but I've stuck at it and love my job.
I once read a quote about our phobia..."I'd rather endure 20 hours of nausea than 20 seconds of being sick"...so true!
Sometimes I think about dealing with this once and for all...but then i chicken out. This is who I am, this is who I'll always be.