Accept your Cross and embrace God's will over your own. Even when your will seems good and holy, like wanting to assist at Mass. Nothing is greater than accepting God's will over your own inclinations, desires, and habits, however holy they might be.
Our Lord is sharing His Cross with you, and hoping to take you to the next level of Love of God.
I think you would get a lot from reading Lives of the Saints right now, especially those who dealt with abandonment to God's will, and who suffered physically.