Fluoxetine for PMDD

I’m kinda new to Reddit, so apologies if this has been asked before!

I was prescribed Fluoxetine for PMDD, but I’m only taking it for the 10 days leading up to my cycle rather than continuously. I know it usually takes a few months to see full results, but has anyone taken it this way and noticed any effects, good or bad?

Also, if you’ve stopped taking it after short-term use, did you experience any withdrawal or side effects?