It is important to remember that inner peace comes from Allah. It does not come from material things. It does not come from drugs or painkillers. It does not come from a sinful lifestyle. Unless our relations with Allah are good, we can never have real inner peace. In order to have inner peace, we must :

Have strong faith and trust in Allah. Make Dhikr of Allah as much as we can. Dhikr brings comfort. We must follow the right path of Islam. Neither misfortune nor prosperity should turn you away from Islam.

Be with good people and be good to others. We must always say good words and do good deeds. Deeds of charity bring real inner peace.

What we do not like others to do to us, we should not do to others.

Be most forgiving. Forgiveness is the best healer and it first heals the person who forgives.