Hello, I understand your concern.
Many of the UTIs are recurrent infections and they re-occur if you do not use medicines strictly.
Medicines for UTI themselves causes nausea
Antibiotic Therapy should be complete and you can use:
1. pantop 40 mg once a day before beakfast for GI problems.
2. ondasetron 4 mg for nausea and vomiting.
If you have periods regularly you might not be pregnant.
Hope this information helped you. You can follow up if have any other problems.