@woody5
Look at my reply to @lindy9
Could you have been during the symptoms dehydrated?

As you can see it was determined by my doctors I was dehydrated and was the cause of my high pulse rate. When I have a ICD shock the first thing they do is check my electrolytes and ask me how much water I have been drinking.

So I have learned my lesson on staying hydrated. The key according to my doctors is to drink water before you are thirsty throughout day. When I was being treated for prostate cancer I found myself not drinking a lot of water because had issues with increased urination and increase need to void.

So I was cutting down on drinking water and it caught up to me as even though now a year after radiation ended I did not go back to drinking a lot of water throughout day.