water retention and mulsle aches

hi, i'm on my 8th day of the master cleanse. i have concerns about water retention i usually try to drink 50 to 60 ounces of water daily, somtimes i'm making myself drink it. seems to me a person shouldn't have to make themselves drink if their not thirsty. i haven't been drinking as much since i've been drinking the lemonade. my urine is still yellow should it be? or should it be clear? when i wake up in the morning my hands are alittle numb and legs and back muscles are tight, my back is aching in a strange way during the day i get like a knot or something under my shoulder blades. i also still feel hungry, can all this be from not getting enough water? i've always contributed it to msg, or to much salt. i was only doing a 10 day cleanse, am i waisting my time if i'm not drinking enough water? i lent my book out so i don't have it to refer back to.

thanks, walrus