No, I am not going to reply to that long list of very specific questions. There is no need to do so, and you have been advised by a PROFESSIONAL that you cannot ever have a risk from an insulin pen. If that is not enough for you, then nothing anyone can say in this forum will rid your mind of the unnecessary anxiety over this NO RISK event.
If you are unable to accept that this is not a risk, we can only suggest that you see professional help to overcome your anxious thoughts.
I'm not GuitarRox, but your doctor is 100% correct that this is a no-risk event that is not of any concern regarding HIV.
Any blood that is not kept in a vacuum-sealed environment is not infections. Blood on the needle of an insulin pen is NOT in a vacuum. Blood inside of a needle with a syringe IS in a vacuum. There is no comparison, and nobody has ever been infected by an insulin pen.
Forget about this event and anything like it, and move on with your life.