Hi Patrycia rose i am no expert on EFT but i have a book on it and from what i have read doing EFT on certain points with statements helps with blocks and release emotions like an onion you peel away the layers the more you do. I feel that you have released some of the fear from the kidneys which will in turn leave some discomfort in the lower back i would say maybe try some root chakra mediataion, try this and i hope it helps. I would then do a solar chakra meditation
https://youtu.be/2DehYTgL0vI
Love GA x