What should I do about having sold a weight-loss drug (via Ananas) seven years ago, which was later withdrawn from the market due to its side effects and unproven efficacy, knowing that I was a recent graduate at the time, do not remember the number of packages I sold, and cannot confide in my husband due to obsessive thoughts?

There is no sin upon you for what happened, as long as you were not aware that the medicine was adulterated or harmful. You are not obligated to guarantee what you sold of it, because you sold on behalf of the pharmacy owners, and you were like a messenger between the seller and the buyer. Rights revert to the principal, and the agent remains in the position of a messenger. There is no guarantee upon him if the defect is hidden, and the buyer returns the merchandise to the principal, not to the agent.