Everything I smell smells bad...?

Okay... like an hour ago, I purchased mayonnaise from the store and when I opened it it smelled bad... It was rotten... so... I bought a different mayonnaise from another store and it smelled the same.. but... now the ketchup and mustard and all the salad dressings I have now smell the same as the mayonnaise... but I know they are fine... what do i do???