I was on Lisinopril and Amlodopine.
Have dropped them both.
If you went from 5K to 12K in one jump that is truly impressive.
BTW, I sometimes break my rowing up into pieces. 2K's in the morning once an hour and then the rest in the afternoon all at once.
I did a 12K today all at once (taking a sip of water every 1K) and was light headed when it was over.
I was on a high...but was still light headed.
Will do another 12K tomorrow....either all at once or broken into manageable pieces.
I do a lot of stretching during the time-outs.
And in my recovery phase, I make sure that my legs are not pulling but are drifting naturally to the "catch" position.