Sulfur allergy?

I recently found out I have an allergy to Sulfa drugs (sulfur).

Is the same Sulfur in Sulfa drugs, in foods? I have only had the reaction to the prescription medicine and never to any foods. But I'm unsure of foods that contain sulfur. It also took a few times of taking the Sulfa drug to have a major reaction.

*EDIT* Sulfur is in the Sulfa drug...I was told to make sure that I let hospitals know I have an allergy to Sulfur and to add that to my allergies.

*EDIT 2*

This is a conversation between me and my mother, who is a nurse.