Based on your history of gallbladder removal and current symptoms, your bowel complaints are most consistent with post cholecystectomy bowel dysfunction or IBS type symptoms, and the medicines prescribed such as rifaximin, vasorex, itokon and psyllium husk are commonly used and appear to be helping your stools, which is a good sign. Difficulty in urination is not a known or common side effect of rifaximin or psyllium husk.
However, medicines like vasorex and itokon, which act on gut motility and smooth muscles, can occasionally cause urinary hesitancy or a feeling of incomplete bladder emptying in some individuals, especially if you are sensitive to them.
Next Steps
At this point, you should not stop all medicines on your own since they are improving your bowel symptoms. The safest approach would be to inform your treating gastroenterologist about the urinary difficulty so that the dose or timing of vasorex or itokon can be adjusted, or one of them can be temporarily withheld to identify the cause. Also ensure you are drinking adequate fluids and not restricting water intake.
Health Tips
If the urinary problem worsens, becomes painful, or you develop burning, fever, or reduced urine output, you should seek medical review promptly to rule out a urinary infection or other causes
Good luck! And do contact in case of any doubt.