Both of my daughters suffer from it as well. My youngest developed it at 7 years old when someone in her class vomited. Things were very difficult for a long time. We could not get her to go back to school for quite sometime.
She is 10 now and doing so much better! Therapy did so much for her
Just like you, I do not have the phobia so it is impossible to understand for us.
Get a good therapist and be supportive, and it will get under control in time