it sounds like you are possibly having a bladder infection which CAN trigger an increase in MS sx. It sounds like its time to go pee in a cup at the MDs office.

My MD says a flair is

Any new or reoccuring old sx
must last at least 24 hours with no breaks
then we have 7 to 10 days to start steroids. After 14 days the recovery rate is the same as those that didnt take the steroids.

A fever, or infection without fever appearing yet can trigger a psuedo exacerbation. Similar to what you are describing.

I hope you call the MD to get a check up.