I'm sorry to hear that you're in so much pain! As someone who has had to suffer with pain myself, I know it can be miserable.
I think you need to pay a visit to your physician. I assume that after the accident you were seen and examined at an emergency room or by your physician, and hopefully they took a look at the hip. It is certainly possible that they missed something the first time around.
Pain that radiates down your leg is actually pretty typical of a back issue, perhaps a bad disc in your spine. Falling into the tub could also have aggravated a disc in your spine, and it may have herniated a bit ("slipped" out of place). So your hip pain with radiation could also be related to that.
In any event, make an appointment with your physician, and they will be able to being or continue to workup, to figure out what is going on here. It could be a hip problem (there may have been a fracture - and these must be treated!), or it could be a back problem, but either way, it would benefit from a visit to your physician or local emergency room.
I hope this helps. Please let me know if you have any further questions - I'm more than happy to try and help.
Take care - Dr. Fay
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