Is the Hajj acceptable for someone whose mind was preoccupied with worldly disputes and who was saddened during the performance of the rituals, and is he obliged to repeat it next year?

What was mentioned does not affect the validity of the Hajj. Your Hajj is valid, and you are not required to repeat it. We advise you to be keen on the soundness of heart of those with whom you have a dispute, and that forgiveness is closer to piety. Strive for repentance, seeking forgiveness, and increasing good deeds, for indeed, good deeds efface evil deeds.