After 9 years i would be surprised if anyone responds, I am 16 years old, and 4 weeks ago i got rhabdo after starting the gym as a thin boy, thinking i could do 4 strenuous workouts in the span of 8 days, and i noticed my urine got really dark, and got super worried like you did and went to the hospital in london where i live, received the same treatment, for 3 days i was given 5L of IV fluids, and i was discharged after the 3rd day, and now i still notice i have a bit of a more noticeable need to urinate, especially when i wake up, although i usually drink a lot of water before i sleep, thanks for your comment dr weinstein aswell