What is the ruling regarding my prayers performed while experiencing flatulence, knowing that I doubted whether there was a specific time for it to become problematic, and must I repeat the prayers I performed with a single ablution while feeling impure?

The questioner is suffering from severe waswas (obsessive whispering/doubts) that makes her doubt her acts of worship. She re-performed the Maghrib prayer and now feels doubtful whether she re-performed it or not. This is at the heart of waswas, and the best cure for it is to completely ignore these doubts.

Her previous prayers are valid, and she is not required to re-perform them as long as she suffers from urinary incontinence, even if she does not know whether it stopped for a period or not.

As for re-performing ablution (wudu') when the time for another prayer enters for someone with incontinence, he is not required to re-perform ablution unless it is invalidated by another hadath (impurity) other than his incontinence. This is the opinion of some jurists, and there is no harm in acting upon it when there is hardship.