Krishna doesn't put you into anxiety. You put yourself into anxiety. Krishna simply makes you go through your course of karmic reaction.
When you find any fault in someone, actually you take the qualities (faults) of that person.
As long as our consciousness is materialistic, there is no room for joy. However on the spiritual platform three things automatically happen: eternity, knowledge and bliss.
If we want something then also we have to abide by the desire of the Supreme Personality of Godhead. Then he will fulfill your desires. That is the way to do things.