Leaving for Houston, TX

Leaving early tomorrow morning to go on a short term mission trip with my church. We will be working with Habital for Humanity to build homes for the Katrina's victims. This is an exciting opportunity because i have always wanted to work with Habital for Humanity, plus, i really wanted to do something when Katrina happened. So, this will be a great way to meet those two goals. It will be a four days trip. We will be working friday and saturday, sunday will be spend worshiping and sight-seeing.
I haven't been able to sleep for the past couple of weeks. I don't know what is wrong with me but i would wake up at night with back aches and chest pains. So, some nights i would sleep on the cough (for some reason, it does relieve some of the pain because of the extra cushions), and other nights, i would take some advils before going to bed. Please pray that the pain would finally go away for this trip because we will be sleeping on hard wood floor or the pew. I am bringing my camping pad, but i am sure it'll be too tough for my back. I have been sensing that this is more a spiritual battle rather than a physical one. I wasn't sure whether it was for this short term trip or for the church's retreat. Since it hasn't go away yet, i assume it's more for this short term trip. So, i am hoping that the pain would be lessen once i am on the plane. Pray that God will prepare the hearts of the people that we'll meet and to bless the house that we'll be building. Especially pray for the people who will be living in those houses. Pray that God will give me courage to say what needs to be said and to say it at the right time.