Feeling good, thanks for asking. I didn't feel the injection at all. Initially, I was wondering if I was being punked, because I felt nothing. But I had a very mild soreness at the injection site the next morning. Apart from that I might have felt very slightly off that evening and for part of the next day, but it was so minor, it may just have been my imagination.
Prior to the booster, I thought I might have to skip today's morning workout, which is 2 days following the injection. Nonsense. I worked out to the limit as usual.
I didn't think to check either my heart rate or BP. I'll probably do that on the weekend if it comes to mind. Last weekend my BP was 111/70, with a heart rate of 59 BPM. This was about 90 minutes or so after my workout.
My tinnitus varies from time to time, so I don't think I can confidently attribute any possibly fluctuation to the shot.