They should never have let you out of the hospital with the significant bleeding you're describing. If your bleeding is STILL fairly significant, get yourself to the ER. The 'balloon' at the end of the foley being inflated at the wrong location (ie: inside your urethra) more than likely caused a tear in the wall, and as the foley (tube) is resting on it, it's unable to properly heal.
Quick procedure to fix a urethral-tear, but it has to be seen in order to be fixed. Jackwad nurse, is all I have to say, and an even bigger jackwad doctor for not seeing you prior to your discharge.
Get yourself to the hospital before you do permanent damage to your urethra.
Good luck to you.
LMNO