thank you for your query.
the complaints you are reffering appear as the after efefcts of the injury
its not a serious injury but you must look out for-
1.back muscle spam
2.blood in urine
3.blood in stools
till then you can use pain killers and pantoprezole
if the symptoms persist i suggest you to take an ultrasound
of the abdomen.
you can contact me for further queries