I am having similar problems. I also get kidney and liver, ovary pain as well strange feelings in my major organs etc etc, but as you say, my lab results come back fine!
However, I have been having a Japanese therapy called shiatsu and she can feel what I feel and is working on it for me. At the moment we are focus on kidneys. She explain to me that Western medicine doesn't recognise or deal with everything which exists. I believe her!
The fact is, my body feels very ill and doctors have nothing to offer me. I know it exists, you know it exists! It is so frustrating, but I have found great comfort in someone laying their hands on me and trying to help. That's all I can suggest! I would deffinately look down the alternative route.