Thanks for the replies, I'm understanding a bit more about it now. I plan on having a bike fit soon, will try foam rollers, and just knowing it can happen if I stay in one position too long will help. It's Tuesday night and it still twinges a bit when I stretch, so going up stairs or trying to walk fast. I was worried on the day it might lead to long term damage or effect.
Bananas are a problem for me, I'm allergic to them. I had been steadily increasing my banana intake over a couple of years and my body became intolerant, great huh!? Need to look up other sources of potassium.