I have forwarded your question to the venerable Sander. He is on retreat right now so I'm not sure if he will be able to respond. If we do not hear from him in a few days I will forward the question to one of the other Monks.
Thank you for participating in our online meditation sessions and this forum. I hope to see you online again this Sunday.
May we all create World Peace through Inner Peace.
It is often our reaction to pain that causes us most harm. As you say you are feeling anger and resentment in response to your pain - this is the first thing that you can take control of.
Fully feel the pain you are experiencing, as well as any mental/emotional resistance that comes with it (such as the anger or resentment). Just for this moment, fully accept the pain and resistance that is there. Just for now, let everything be as it is, and do not try to change how you feel. You may find your mind resisting this, since this part of your mind lives on resistance. This is your chance to evolve spiritually and to transcend pain, and perhaps get rid of it.
Completely accept what this moment is presenting to you. If you can, welcome your pain with a feeling of love and gratitude, since it is your tool to increase your state of inner peace. This loving energy can be extremely healing, and has the power of at least separating you from the pain. You are the awareness of pain, not the pain itself. Feel that you are the observing consciousness behind the pain, not involved with it. Then, as you fully accept the feeling that is there (no longer label it "pain") the pain will weaken, or you will simply transcend it.
If you fully accept the pain you are in, you become instantly at peace, and the pain will also probably weaken, or at least not take control of you as much.
The anger and resentment the mind generates is completely pointless, other than keeping you in a negative mental state.
Be the awareness, and love whatever arises in your awareness, especially physical and emotional pain. Love transmutes it into more love and peace. In this state, you become much more peaceful whether pain is there or not, and your acceptance of the pain brings your healing power of your consciousness into the pain.
I hope this helps. I have a pain meditation page on my website where you can listen to a free audio guided version if you should wish. It is similar to what I have written above, but it is more clearly "step by step". Go to "Physical Pain Meditation" halfway Down this page www.innerpeacenow.com/Pain-Meditation.html