Your bloodpressure is okay for your age. You heart racing like that is normal too. It's called tachycardia
I experienced the same thing and was the medical manager for a cardiovascular surgeon. He explained that it's better that the heart is beating than if it stops. Nothing to worry about but make sure that you aren't getting anemic. Low iron can also cause your heart to race. When mine does it I cough
to get it to stop and get it to beating normal. If you notice if you ever get excited about something your heart does it too, but you really don't notice it because your excited.