You're severely dehydrated. Consider going to the hospital along with drinking 64 oz of water MINIMUM a day. I'd start with 32oz tonight within the next two hours.
If there is plenty of urine and it's Coca-Cola brown, it could be hepatitis. See your doctor, sweetheart. Call and tell them the problem and see when they can get you in, I'll bet it's pretty fast.
When I had brown urine I went 2 the ER and found out I had passed a kidney stone..but I had blood clots in it as well. I would most certainly talk 2 my doctor about it, because it could b multiple things.