?

[ajkl]

I have sort of a unusual question but... esentially all I drink is water and yet my urine is still a very dark color and I've been getting pins in my stomach (an inch or so belowmy naval), Im also always thirsy no matter how much I drink and have been getting pains in the backs of my knees, the sort that would normally result from weak circulation. I also nearly blacked out three times in rapid succession about a month ago (around the time all this started) and thats the first time anything like that had ever happened to me. Bearing in mind that I am only 19, does anyone know of any illnesses that have these kinds of symptomes?