Thank you for writing JustAnswer.
Did he hit you int the kidney area forcefully?
Do you notice pink or red urine?
Well, it sounds as if possibly there could be kidney bruising. You must definately go in and get x-rays and examined ASAP. I don't know much about the legal process, we do have a legal section here, if you need to ask them anything, but for your physical safety you should go in and get examined.
If you have any questions, let me know.