Dear del,
hope you've faired well. I have the same issue after vomiting. Seems one trip into the local micdee's got me 4 days in the hospital with a torn stomach wall. Can't get near a chocolate shake.
Start with simple comfort foods, tea, toast, crackers, soup, vegies. Work your way up to the complex meals in several days. Gain trust that these will be ok and it was just a simple item that went bad.
Start remembering what shouldn't be in the refrig too long. Meat and take out over 3 days. 'cept t-day turkey. Deli items, hot dogs out of the package up 1 week.
Remember this to start with what a baby starts with. Simple foods. You can control the anxiety by understanding and working away the fear.
Best wishes mate.