“Can there be a relationship between blood sugar and high respiratory rate?”

I am 72 years old, 6'2" and 160 lbs. I exercise 9 hours a week (cardio & weights).

During my cardio training I maintain a 136-140 heart rate for 30 minutes. My respiratory rate runs around 32 most of that time, but can go up to 47 for short periods. My blood pressure normally runs around 110/55 with a resting pulse rate of 44. I take NO medications and I am also raw vegan.

Today, I had just eaten a big bowl of grapes and a banana. I felt the banana, which I normally don't include, spiked my blood sugar. I then when out to bag leaves and while raking the leaves out of the flower beds I felt a little jittery. After that I was trying to start the lawnmower to bag the leaves and it wouldn't start. I had pulled the crank for maybe 45 seconds and got out of breath, so I stopped. My respiratory rate was around 47. I know this from doing cardio at the gym.

Here's where things get crazy...
My respiratory rate did not go down. It had been several minutes and I was still breathing hard. Then broke out in a sweat that soaked my shirt. I had walked into the house by now and grabbed my Oximeter. My pulse rate was in the 90's & oxygen was 98%. Then my pulse started slowing, it moved into the 70's, even though I was still breathing hard. My breath eventually started slowing and I became chilled, my body started tingling and I felt weak. I put on a hooded fleece sweat shirt to get warm. After a few minutes I went and took a hot shower.

After the shower, I took my blood pressure:
Left Arm: 107/56, Right Arm: 108/61, Pulse: 46
I now felt normal.

I don't feel like it was a cardiovascular issue. I suspect it was a blood sugar related. I have never in my life experienced anything close to this, nor have I sweated as much in such a short period.