For a couple of months I have been suffering from bladder problems - particularly at night. The frequent need to intimate, a constant pressure as if I’m bursting for a wee and someone is sitting on my bladder however when I urinate there is little or no urine. I am taking nitrofurantoin and have just finished day 2 however no improvement. I was told my urine sample was negative however was prescribed 7 days. I’m worried this could be something worse. I am 21 years old and female