Mother Angelica spoke about this some time ago. Even before her last stroke, she has had much pain throughout her life.
She said that if you have a headache, take a pain reliever. You can still offer your pain to God and if it goes away, fine; if it doesn’t, just keep offering!
I have been dealing with chronic health problems for the last four years and am learning much about offering my pain. As you mentioned, we can offer everything to God – our entire day – works, rest, joys, pains, sufferings, prayers. The morning offering is one of the most important prayers we can say each day.
Rosalind Moss on Catholic Answers has also said that we can offer to God our worry and anxiety, depression and discouragement – and all can have merit if we join our sufferings to that of Jesus!
Bishop Fulton Sheen said that this world has so much wasted suffering. Don’t let it go to waste!
Sometimes if I wake in the night with pain or discomfort, I begin praying and offering it for whoever needs God’s mercy and grace the most at that moment. We’ll never know until we get to heaven all the souls we may have helped through Jesus!
One of my favorite prayers to say when I’m feeling discouraged is the closing prayer of the Chaplet of Divine Mercy:
Eternal God, in Whom mercy is endless and the treasury of compassion inexhaustible, look kindly upon us and increase Your Mercy in us so that in difficult moments we might no despair nor become despondent, but with great confidence submit our lives to Your Holy Will, which is Love and Mercy Itself!
Mother Teresa told her sisters to “Love until it hurts. It hurt Jesus to love us.”
Know that Our Lord is using you to reach others, and you are participating in a small part of His passion. (Read my tag line)