What would you do if you were being slowly poisoned in doses so small it was not easily found by a doctor so no one believed you?

Id have to figure it out myself. If i thought that, id start monitoring my food and not let anyone make me anything. Maybe look up some types of poisons that could be causing the symptoms i feel. Maybe i could find the poison among people around me.

Maybe if someone was pushing me to eat homecooked meals or something id pay alot of attention to them.