Stricken means being direly affected by an unpleasant and an unpalatable feeling or condition or trouble. It could mean appearance of showing great distress.
"Upon hearing about the death of his mother, Jake was stricken with grief."
Struck is the past tense and past participle of the word, strike which means to deal a blow or strike to a person, inflicting them with damage.
"When the fight got intense, I silently struck him from behind."