With physical issues like this if the symptoms disappear initially with EFT but then return, that's a strong indication that there will be an emotional component to them. EFT Master Carol Look has a series of questions that might be able to help you to find leads to tap on, you can find them at http://www.emofree.com/Articles2/ask-right-questions.htm
Perhaps you could have a read of the questions and write down the answers and try tapping on what comes up, then come back to us with more questions and observations of what happened with them, and we might be able to give some more ideas to tap on. The key with EFT is following the clues that come up as you tap, so if for example you are tapping on something and you suddenly start thinking about an event from the past that seems unrelated, trust that it's a clue from your subconscious and follow the trail (tap on the event that has come up and see where that takes you.)
Very best wishes,
Jo
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