Then I don't understand you. What is important to address the problems you outlined is the question of "How brain activity corresponds to the felt experiences (

Then I don't understand you. What is important to address the problems you outlined is the question of "How brain activity corresponds to the felt experiences (as reported by subjects)?", not "Why there are felt experiences corresponding to brain activity?" Even if we had the answer for the second question (say, "There is immaterial soul which is responsible for our felt experiences and that's why we feel"), it will not help with pain treatment.