Post Fast Back Pain

Hello All,

Last week I had done 3.5 day fast. I broke the fast with organic grapefruit, the yellow kind. I have this funny pain in my back as shown in the areas in the photo below. It is definitely not muscular or bones, but internal. I feel that it may have something to do with kidneys. I do hydrate myslef regularly. Only observation I have is that when I drink black tea, I have the pain more noticeably. I usually do not go to doctors, but since it has lasted one week, I may. If anyone has some information on this or similar experience, I appreciate in advance if you can post here.

Thank you all for being helpful with my fast.

Kask