Hello!
Well, look, as you say, focus on the positive!
It was great that the hospital noticed your menstrual cycle and postponed the surgery. Who knows what would have happened if they had operated on you like this under your current circumstances!
So, after letting off steam, screaming, and crying (yes, because I understand you need to let go of that burden that's weighing you down and you deserve to let it go), focus on the positive aspects of this whole experience. It will allow you to face new challenges with renewed energy.
For now, enjoy swimming today and everything planned for the week!