Thank you very much for the useful information Sylvia.
Injured/ruptured spleen is a surgical emergency and if not diagnosed and treated immediately can lead to serious symptoms and complications including death with in hours.
Since this trauma happened few days back, and you do not have any symptoms of peritonitis or intra-abdominal bleed (such as tender distended abdomen, absolute constipation, pallor, fall in blood pressure and sepsis ---- which is the usual course of events when one get splenic rupture), i do not believe that you have any such injury at this point.
Ultram is a good pain medicine but one of its common side effects is urinary retention ---- so that might be the main reason for the urinary problems you have.
Keep yourself adequately hydrated.
And talk to your doctor again discussing all the details i have mentioned to chalk out further management plan that suits best to your needs.
Your doctor might shift you from ultram to other pain medicines like Motrin or Aleve or Tylenol or combination of any of these.
I would have been worried too if I were at your place, but let me reassure you that this does not sound serious at all.
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