I don't know exactly the answer to your question, as i don't know your history or what else is happening in your body, but did a course in traditional chinese medicine and recommend seeing someone who knows about the 5 elements and helping to balance organs and chi in the body.

kidney is connected to the emotion for fear...it is also the water element. you can maybe google TCM and kidney and see what you come up with. in the juicing book, there are suggestions for kidney, but i don't recall what it was exactly...so go to this link

www.juicingbook.com/search/search.cgi

you could also go to the library and look up books on juicing to help tonify or strengthen the kidney in the index. since there is so much info, i would just find a chinese doctor that does accupuncture and prescribes chinese herbs to take on your case. try it for a little while and make up your own mind. also, consider doing a kidney flush, there are a number of recipes on line (hulda clark) or some people have a program you can follow (dr. schultz)...but if you're worried about taking matters into your own hands, you will want to consult a physician before doing anything that could be too much a shock on the body.

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here are some tidbits i found on the internet...

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Kidney Stones and Other Kidney Related Problems:

If you suffer from kidney stones, then you will definitely want to avoid juices made from vegetables such as spinach, beets, collard greens and some other vegetables. These vegetables are higher in oxalic acid.

If you do suffer from kidney stones or other kidney related problems, then consult your medical doctor or naturopathic doctor before juicing.

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Although lycium fruit (is this Lychee (dragon eyeballs)?) was described in the Shennong Bencao Jing (ca 100 A.D.), its use in traditional formulas was rather limited until the end of the Ming Dynasty period (1368–1644). At that time, it was frequently combined with tonic herbs such as rehmannia, cornus, cuscuta, and deer antler to nourish the “kidney” (as described in Chinese medicine) for the treatment of a variety of deficiency syndromes.

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Watermelon juice, for instance, is traditionally used for bladder and kidney problems...
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• When a person is constitutionally yin deficient, overwork, prolonged stress or illness, excessive sexual activity and pregnancy can consume the essence. The result is deficiency of Kidney yin which can in turn lead to blazing of Kidney fire. 'Kidney fire' is characterized by frequent, copious urination, cloudy urine (as if containing grease), progressive weight loss, dizziness, blurred vision, sore back, ulceration or itching of the skin, and vaginal itching. The tongue is red with scanty or no coating and the pulse is fine and rapid.

All three patho-mechanisms involve the mutual exacerbation of yin deficiency and dry heat scorching Kidney yin essence and the fluids of the Lung and Stomach. Yin deficiency is primarily associated with the Kidneys, and according to the principle that detriment to yin affects yang, Kidney yang deficiency is also invariably observed in prolonged cases. Therefore xiao-ke syndrome may also occur when there is deficiency of Kidney yang.