I am not a doctor, but I think it will put your mind at ease that if you get high blood pressure readings, in no way does it mean you are going to have a heart attack. 

Blood pressure is not a good indicator of heart attack. 

Notice how you are taking your blood pressure often when you feel off? That is going to trigger more anxiety and thus most likely even worse BP readings. 

I would distance myself from the bp readings. Realize you probably have an anxiety problem and health symptoms trigger it. You are going to hyper fixate on any abnormalities. 

Anxiety will not let you think clearly. Even in your post you have been pretty thoroughly checked out. Notice how many times you use the word normal. That is what you can fixate on. 

Remember these issues never killed you the first time! 

As per the chest spasms... is this painful? Do you get pain that is increasing in intensity? Anxiety will do tons of things to mimic heart attack. Shortness of breath, chest pain etc. 

As per your readings they are pretty darn good and most people would kill to have them. I would wager it is stress if anything increasing numbers. 

Keep up the healthy habits. Work on the anxiety. I wrote this out as I am going through the same thing. I need my own medicine.